Tektronix RSA3408A User Manual

Download

User Manual

RSA3408A Option 29 WLAN 802.11a/b/g/n Analysis Software

071-1648-01

This document supports firmware version 3.31 and above.

www.tektronix.com

Copyright © Tektronix. All rights reserved. Licensed software products are owned by Tektronix or its subsidiaries or suppliers, and are protected by national copyright laws and international treaty provisions.

Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supercedes that in all previously published material. Specifications and price change privileges reserved.

TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.

Contacting Tektronix

Tektronix, Inc. 14200 SW Karl Braun Drive P.O . B o x 5 0 0 Beaverton, OR 97077 USA

For product information, sales, service, and technical support:

 In North America, call 1-800-833-9200.  Worldwide, visit www.tektronix.com to find contacts in your area.

Warranty 2

Tektronix warrants that this product will be free from defects in materials and workmanship for a period of one (1) year from the date of shipment. If any such product proves defective during this warranty period, Tektronix, at its option, either will repair the defective product without charge for parts and labor, or will provide a replacement in exchange for the defective product. Parts, modules and replacement products used by Tektronix for warranty work may be new or reconditioned to like new performance. All replaced parts, modules and products become the property of Tektronix.

In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration of the warranty period and make suitable arrangements for the performance of service. Customer shall be responsible for packaging and shipping the defective product to the service center designated by Tektronix, with shipping charges prepaid. Tektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the Tektronix service center is located. Customer shall be responsible for paying all shipping charges, duties, taxes, and any other charges for products returned to any other locations.

This warranty shall not apply to any defect, failure or damage caused by improper use or improper or inadequate maintenance and care. Tektronix shall not be obligated to furnish service under this warranty a) to repair damage resulting from attempts by personnel other than Tektronix representatives to install, repair or service the product; b) to repair damage resulting from improper use or connection to incompatible equipment; c) to repair any damage or malfunction caused by the use of non-Tektronix supplies; or d) to service a product that has been modified or integrated with other products when the effect of such modification or integration increases the time or difficulty of servicing the product.

THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THE PRODUCT IN LIEU OF ANY OTHER WARRANTIES, EXPRESS OR IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. TEKTRONIX’ RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY. TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.

Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii

About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii

Related Manuals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii

Getting Started

Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Measurement Items . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Accessing the Measurements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Operating Basics

Operating Basics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Screen Elements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Setting Frequency and Span. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Setting Timing Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

View Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Saving Measurement Results. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9

Reference

IEEE802.11a/b/g Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Basic Measurement Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Meas Setup Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

Measurement Setup for Modulation Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

Measurement Setup for Spectrum Mask . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9

Measurement Setup for Transmit Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10

View Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11

View Format for Modulation Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12

View Format for Power Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-37

802.11n (nx1) Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-43

Data Process Flow for MISO (2x1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-44

Basic Measurement Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-45

Meas Setup Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-46

Measurement Setup for Modulation Measurements . . . . . . . . . . . . . . . . . . . . . . . . . 3-47

Measurement Setup for Spectrum Mask . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-52

View Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-55

View Format for Modulation Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-57

View Format for Power Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-90

802.11n MIMO Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-93

Data Process Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-93

Basic Measurement Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-95

Meas Setup Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-98

View Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-102

RSA3408A Option 29 User Manual

Table of Contents

Appendices

Glossary and Index

Appendix A: Scale Setting Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1

Appendix B: Save File Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1

Transfer Function (Amplitude and Phase) and Delay Profile . . . . . . . . . . . . . . . . . . . B-2

EVM vs Time, Power vs Time, and Frequency Error. . . . . . . . . . . . . . . . . . . . . . . . . B-4

EVM vs SC, Power vs SC, and OFDM Flatness. . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-6

Symbol Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-8

RSA3408A Option 29 User Manual

List of Figures

Figure 1-1: WLAN analysis display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Figure 1-2: Signal format in IEEE802.11n analysis . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Figure 1-3: Measure menu in the WLAN analysis . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Figure 2-1: Screen elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Figure 2-2: Timing parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

Figure 2-3: Definition of the View Scale menu items . . . . . . . . . . . . . . . . . . . . . . . 2-8

Figure 2-4: Setting packets to be saved . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10

Figure 3-1: IEEE802.11a/b/g measurement menu . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Figure 3-2: Modulation Type Display Filter setting . . . . . . . . . . . . . . . . . . . . . . . 3-8

Figure 3-3: IEEE802.11a/b spectrum mask . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9

Figure 3-4: Burst indicator on the overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10

Figure 3-5: EVM versus Time (main view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12

Figure 3-6: MagErr versus Time (main view) . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14

Figure 3-7: PhaseErr versus Time (main view) . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15

Figure 3-8: Power versus Time (main view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16

Figure 3-9: Constellation (main view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18

Figure 3-10: EVM versus SC (main view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-19

Figure 3-11: EVM versus Time (main view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21

Figure 3-12: MagErr versus SC (main view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22

Figure 3-13: MagErr versus Time (main view) . . . . . . . . . . . . . . . . . . . . . . . . . . 3-23

Figure 3-14: PhaseErr versus SC (main view) . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-24

Figure 3-15: PhaseErr versus Time (main view) . . . . . . . . . . . . . . . . . . . . . . . . . 3-25

Figure 3-16: Power versus SC (main view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-26

Figure 3-17: Power versus Time (main view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-28

Figure 3-18: Symbol Constellation (main view) . . . . . . . . . . . . . . . . . . . . . . . . . . 3-29

Figure 3-19: Symbol Constellation (main view) . . . . . . . . . . . . . . . . . . . . . . . . . . 3-30

Figure 3-20: Frequency error (main view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-31

Figure 3-21: OFDM flatness (main view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-33

Figure 3-22: OFDM linearity (main view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-35

Figure 3-23: Symbol table (main view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-36

Figure 3-24: Spectrum mask (OFDM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-37

Figure 3-25: Spectrum mask (DSSS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-39

Figure 3-26: Transmit power on (main view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-40

Figure 3-27: IEEE802.11b Transmit power-on ramp . . . . . . . . . . . . . . . . . . . . . 3-41

Figure 3-28: Transmit power down (main view) . . . . . . . . . . . . . . . . . . . . . . . . . 3-42

Figure 3-29: IEEE802.11b Transmit power-down ramp . . . . . . . . . . . . . . . . . . 3-42

Figure 3-30: IEEE802.11n (nx1) measurement menu . . . . . . . . . . . . . . . . . . . . . 3-43

Figure 3-31: Data process flow for MISO (2x1) . . . . . . . . . . . . . . . . . . . . . . . . . . 3-44

Figure 3-32: Modulation Type Display Filter setting in the nx1 analysis . . . . . 3-50

Figure 3-33: 802.11n (nx1) spectrum mask . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-52

Figure 3-34: Editing the spectral mask . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-53

Figure 3-35: List display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-56

Figure 3-36: Measurement result display (an example of EVM versus Time) . 3-57

Figure 3-37: Transfer function, amplitude (main view) . . . . . . . . . . . . . . . . . . . 3-59

RSA3408A Option 29 User Manual

iii

List of Figures

Figure 3-38: Transogram, amplitude (subview) . . . . . . . . . . . . . . . . . . . . . . . . . . 3-60

Figure 3-39: Transfer function, phase (main view) . . . . . . . . . . . . . . . . . . . . . . . . 3-61

Figure 3-40: Transfogram, phase (subview) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-62

Figure 3-41: Delay profile (main view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-63

Figure 3-42: Delayogram (subview) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-64

Figure 3-43: EVM versus Time (main view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-65

Figure 3-44: MagErr versus Time (main view) . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-67

Figure 3-45: PhaseErr versus Time (main view) . . . . . . . . . . . . . . . . . . . . . . . . . . 3-68

Figure 3-46: Power versus Time (main view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-69

Figure 3-47: Constellation (main view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-71

Figure 3-48: EVM versus SC (main view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-72

Figure 3-49: EVM versus Time (main view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-74

Figure 3-50: MagErr versus SC (main view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-75

Figure 3-51: MagErr versus Time (main view) . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-76

Figure 3-52: PhaseErr versus SC (main view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-77

Figure 3-53: PhaseErr versus Time (main view) . . . . . . . . . . . . . . . . . . . . . . . . . . 3-78

Figure 3-54: Power versus SC (main view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-79

Figure 3-55: Power versus Time (main view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-81

Figure 3-56: Symbol Constellation (main view) . . . . . . . . . . . . . . . . . . . . . . . . . . 3-82

Figure 3-57: Symbol Constellation (main view) . . . . . . . . . . . . . . . . . . . . . . . . . . 3-83

Figure 3-58: Frequency error (main view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-84

Figure 3-59: OFDM flatness (main view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-86

Figure 3-60: OFDM linearity (main view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-88

Figure 3-61: Symbol table (main view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-89

Figure 3-62: Spectrum mask (OFDM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-90

Figure 3-63: IEEE802.11n MIMO 2x2 measurement menu . . . . . . . . . . . . . . . . 3-93

Figure 3-64: MIMO (2x2) data process flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-94

Figure 3-65: Connecting the rear panel connectors . . . . . . . . . . . . . . . . . . . . . . . 3-95

Figure 3-66: Transferring captured data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-96

Figure 3-67: Modulation Type Display Filter setting in the MIMO analysis . . 3-100

Figure 3-68: List display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-103

Figure 3-69: Waveform Rx1/2 (subview) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-104

Figure 3-70: Transfer function, amplitude (main view) . . . . . . . . . . . . . . . . . . . 3-105

Figure 3-71: Transfogram, amplitude (subview) . . . . . . . . . . . . . . . . . . . . . . . . 3-106

Figure 3-72: Transfer function, phase (main view) . . . . . . . . . . . . . . . . . . . . . . . 3-107

Figure 3-73: Transfogram, phase (subview) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-108

Figure 3-74: Delay profile (main view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-109

Figure 3-75: Delayogram (subview) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-110

Figure B-1: Measurement results file (an example of amplitude

transfer function) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1

RSA3408A Option 29 User Manual

List of Tables

Table 1-1: IEEE802.11 standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Table 1-2: Option 29 WLAN measurement items . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Table 2-1: Channel table for the WLAN analysis . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Table 2-2: Span setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

Table 3-1: Measurement setup reference for the 802.11a/b/g analysis . . . . . . . . 3-4

Table 3-2: Modulation detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

Table 3-3: Submenu availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

Table 3-4: Length of an analysis symbol, IEEE802.11a/g . . . . . . . . . . . . . . . . . . . 3-7

Table 3-5: View content selection, IEEE802.11a/b/g . . . . . . . . . . . . . . . . . . . . . . 3-11

Table 3-6: Vertical setting range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13

Table 3-7: Vertical setting range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-20

Table 3-8: Measurement setup reference for the 802.11n (nx1) analysis . . . . . 3-46

Table 3-9: Submenu availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-48

Table 3-10: Length of an analysis symbol, IEEE802.11n . . . . . . . . . . . . . . . . . . 3-49

Table 3-11: View content selection, 802.11n (nx1) . . . . . . . . . . . . . . . . . . . . . . . . 3-55

Table 3-12: Vertical setting range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-66

Table 3-13: Vertical setting range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-73

Table 3-14: Submenu availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-99

Table 3-15: View content selection, 802.11n MIMO (2x2) . . . . . . . . . . . . . . . . 3-102

Table A-1: Scale setting range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1

RSA3408A Option 29 User Manual

List of Tables

RSA3408A Option 29 User Manual

Preface

About This Manual

This manual provides operating instructions for the RSA3408A Real-Time Spectrum Analyzer Option 29 WLAN 802.11a/b/g/n Analysis Software.

This manual is composed of the following sections:

 Getting Started provides overviews of the product and its functions.

 Operating Basics provides information needed for routine operation.

 Reference describes the measurement procedure, setup menu, and view format

specific to Option 29 in detail.

 Appendices provides additional information, including the scale setting range

and save file format.

The analyzer uses Microsoft Windows XP as the operating system. This manual does not describe common usage of Windows XP. Refer to your Windows manuals as necessary.

Related Manuals

PDF Manual

The following related documents are also available:

 RSA3408A User Manual

(Standard accessory; Tektronix part number 071-1617-XX) Describes how to install the analyzer and how to work with the menus, and details the standard functions. Also shows the specifications.

 RSA3408A Programmer Manual

(Standard accessory; PDF, Tektronix part number 077-0003-XX) Contains an alphabetical listing of the programming commands and other information related to controlling the analyzer over the GPIB interface.

The programmer manual described above is a PDF document (the file size is about 3 MB). The file is stored in this directory on the analyzer hard disk:

C:\Program Files\Tektronix\wca200a\Manuals

Use the USB or LAN interface to copy the file onto your PC. Refer to the RSA3408A User Manual for information about using the interface.

RSA3408A Option 29 User Manual

vii

Preface

viii

RSA3408A Option 29 User Manual

Getting Started

RSA3408A Option 29 is the WLAN 802.11a/b/g/n analysis software that performs signal measurements for high-speed wireless LAN transmitters in 5 GHz and

2.4 GHz bands complying with the IEEE802.11 a, b, g, and n standards. Table 1-1 summarizes the IEEE802.11 standards.

Table 1-1: IEEE802.11 standards

WLAN standard Frequency band Modulation method Tx rate (max)

IEEE802.11a 5 GHz OFDM BPSK, QPSK, 16QAM 54Mbps IEEE802.11b 2.4 GHz DSSS DBPSK, DQPSK, CCK 11Mbps IEEE802.11g 2.4 GHz OFDM-CCK DBPSK, DQPSK, CCK, BPSK, QPSK, 16QAM 54Mbps

PBCC DBPSK, DQPSK, CCK, PBCC 33Mbps OFDM BPSK, QPSK, 16QAM 54Mbps

IEEE802.11n 2.4 GHz / 5 GHz OFDM BPSK, QPSK, 16QAM, 64QAM >100Mbps

This software is compliant with Draft 11n as of December 2006.

Figure 1-1 shows a typical display example of WLAN analysis.

Figure 1-1: WLAN analysis display

RSA3408A Option 29 User Manual

1-1

Getting Started

Measurement Items

Table 1-2 shows all the measurement and display items available in Option 29 WLAN analysis software and the supported standards. The measurement items are classified into Modulation measurement and Power measurement.

Table 1-2: Option 29 WLAN measurement items

Measurement Measure menu item Modulation measurement

Transfer Function (Amplitude and Phase)

Delay Profile EVM versus Time EVM

Power versus Time Constellation EVM versus SC EVM

Power versus SC SC Constellation Frequency Error OFDM Flatness OFDM Linearity Symbol Table -

Power measurement

Spectrum Mask Transmit Power -

Abbreviation. Err: Error; Mag: Magnitude; SC: Subcarrier. Refer to

contents

Mag Err

Phase Err

Mag Err

Phase Err

802.11a 802.11b 802.11g

✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓

✓ ✓ ✓ ✓ ✓

Glossary

802.11n (

nx1

)

✓ ✓

for acronyms.

802.11n (MIMO)

1-2

Selectable in the View Scale menu.

NOTE.

For the 802.11n standard, this software is compliant with Draft 11n as of

December 2006.

RSA3408A Option 29 User Manual

Getting Started

Signal Format in

IEEE802.11n Analysis

IEEE802.11n analysis consists of 802.11n (nx1) and MIMO (2x2) analyses, supporting three signal formats as shown in Figure 1-2.

802.11n (nx1) analysis

SISO 1x1 (one Tx antenna and one Rx antenna)

Transmission

Antenna

MISO 2x1 (two Tx antennas and one Rx antenna)

Transmission

802.11n MIMO (2x2) analysis

MIMO 2x2 (two Tx antennas and two Rx antennas)

Reception

Transmission

OutputPropagation pathInput

Reception

Figure 1-2: Signal format in IEEE802.11n analysis

MIMO (Multi-Input Multi-Output) uses more than one antennas for both transmitting and receiving to transfer data at the same time. Radio signals input from the transmitter go through multiple propagation paths and output to the receiver. Multiple antennas send and receive different data streams simultaneously over multiple paths as independent channels, resulting in a higher transmission rate along with the number of antennas. Special, degenerated cases of MIMO are

MISO (Multi-Input Single-Output) when the receive antenna is single, and SISO (Single-Input Single-Output) when both transmit and receive antennas

are traditionally single. The Option 29 WLAN analysis software supports three signal formats: SISO 1x1, MISO 2x1, and MIMO 2x2.

RSA3408A Option 29 User Manual

1-3

Getting Started

Accessing the Measurements

The Option 29 WLAN measurement functions are contained in the Demod mode as shown in Figure 1-3. The analysis is categorized into three groups: IEEE

802.11a/b/g, 802.11n (nx1, Multi-Input Single-Output), and 802.11n MIMO (Multi-Input Multi-Output, 2x2).

MODE

S/A

DEMOD

TIME

Measure menu items

Standard... IEEE802.11a/b/g EVM versus Time

Power ve r sus Time Constellation EVM versus SC Power ve r sus SC SC Constellation Frequency Error OFDM Flatness OFDM Linearity Symbol Table Spectrum Mask Tra n s m i t Po w e r

802.11n (nx1) Transfer Function (Amp)

802.11n MIMO (2x2) Transfer Function (Amp)

Transfer Function (Phase) Delay Profile EVM versus Time Power ve r sus Time Constellation EVM versus SC Power ve r sus SC SC Constellation Frequency Error OFDM Flatness OFDM Linearity Symbol Table Spectrum Mask

Transfer Function (Phase) Delay Profile EVM versus Time Power ve r sus Time Constellation EVM versus SC Power ve r sus SC SC Constellation Frequency Error Symbol Table

1-4

Figure 1-3: Measure menu in the WLAN analysis

RSA3408A Option 29 User Manual

Operating Basics

This section describes the basic operation specific to the WLAN analysis with the following topics:

 Screen Elements

 Setting Frequency and Span

 Setting Timing Parameters

 View Operation

 Saving Measurement Results

NOTE.

User Manual.

For complete details on operating the analyzer, refer to the RSA3408A

RSA3408A Option 29 User Manual

2-1

Operating Basics

Screen Elements

Figure 2-1 shows the screen elements of the WLAN analysis. The analysis runs in the Demod (modulation analysis) mode and displays the following three views on the screen. The spectrum mask measurement is an exception; it uses a single view like the S/A (Spectrum Analyzer) mode.

 Overview. Displays all data in one acquisition block. Use this overview to set

the timing parameters such as acquisition length and analysis length (refer to Setting Timing Parameters on page 2-6).

 Main view. Displays the measurement results and waveform for the range

specified in the overview.

 Subview. Displays the spectrum (by default) for the range specified in the

overview. You can select the view content with the View Define menu.

For details on setting the views, refer to View O pe rati o n on page 2-7.

Hardware setting

Main view

Trigger status

SubviewOverview

Side menu

2-2

Current setting

Figure 2-1: Screen elements

RSA3408A Option 29 User Manual

Setting Frequency and Span

Use the FREQUENCY/CHANNEL and the SPAN keys on the front panel to set frequency and span. For WLAN analysis, you can use the channel tables shown in Table 2-1.

Table 2-1: Channel table for the WLAN analysis

Channel Table Channel Center frequency (GHz)

IEEE 802.11a 34 5.170

Operating Basics

36 5.180 38 5.190 40 5.200 42 5.210 44 5.220 46 5.230 48 5.240 52 5.260 56 5.280 60 5.300 64 5.320 100 5.500 104 5.520 108 5.540 112 5.560 116 5.580 120 5.600 124 5.620 128 5.640 132 5.660 136 5.680 140 5.700 149 5.745 153 5.765 157 5.785 161 5.805

RSA3408A Option 29 User Manual

2-3

Operating Basics

Table 2-1: Channel table for the WLAN analysis (cont.)

Channel Table Channel Center frequency (GHz)

IEEE 802.11b/g 1 2.412

2 2.417 3 2.422 4 2.427 5 2.432 6 2.437 7 2.442 8 2.447 9 2.452 10 2.457 11 2.462 12 2.467 13 2.472 14 2.484

IEEE 802.11n (2.4 GHz)

IEEE 802.11n (5 GHz)

1 2.422 2 2.427 3 2.432 4 2.437 5 2.442 6 2.447 7 2.452 1 5.190 2 5.230 3 5.270 4 5.310 5 5.510 6 5.550 7 5.590 8 5.630 9 5.670 10 5.755 11 5.795

2-4

RSA3408A Option 29 User Manual

Operating Basics

The span setting depends on the measurement item as shown in Table 2-2.

Table 2-2: Span setting

Analysis type Measurement item Span

Modulation analysis Transfer Function 20 or 36 MHz

Delay Profile EVM versus Time Power versus Time Constellation EVM versus SC Power versus SC SC Constellation Frequency Error OFDM Flatness OFDM Linearity Symbol Table

Power analysis Spectrum Mask 100 MHz to 3 GHz

Transmit Power 20 or 36 MHz

(The default is 36 MHz)

RSA3408A Option 29 User Manual

2-5

Operating Basics

Setting Timing Parameters

Press the TIMING key to set the timing parameters described below on the overview (see Figure 2-2).

Acquisition Length.

Acquisition History.

Spectrum Length.

Spectrum Offset.

Analysis Length.

Analysis Offset.

Output Trigger Indicator.

Sets the time to acquire one block.

Specifies the number of the block to analyze and display.

Shows time for FFT to display spectrum in the subview.

Sets the beginning of Spectrum Length.

Sets the analysis range in time units (max. 100 ms).

Sets the beginning of Analysis Length.

Turns on or off the output trigger indicator.

For details on setting the timing and trigger, refer to the RSA3408A User Manual.

Analysis Offset

Spectrum Offset

Acquisition History

Analysis Length

2-6

Overview

The data in the analysis range (indicated by the green lines) is analyzed and the result is displayed in the main view.

Output Trigger Indicator

Acquisition Length

Figure 2-2: Timing parameters

NOTE.

Only Acquisition Length is available in the Transmit Power measurement.

The Timing menu is not available in the Spectrum Mask measurement.

RSA3408A Option 29 User Manual

View Operation

Operating Basics

This section provides view operating basics, addressing the following topics:

 Changing the View Content

 Selecting the Phase Unit

 Scaling the Graph

Changing the View Content

Selecting the Phase Unit

You can change the view content with the VIEW: DEFINE key on the front panel. The View Define menu has the following controls.

Show Views.

 Single. Displays one view on screen.

Selects the single or multi view.

Select the view with the VIEW: SELECT key.

 Multi. Displays the overview, the main view, and the subview on screen.

Overview Content...

Subview Content...

Selects the overview content.

Selects the subview content.

The view contents depend on the measurement items. Refer to each

The phase unit in the EVM measurement defaults to degrees. You can select degrees or radians using the following steps:

1. Press the SYSTEM key.

2. Press the Instrument Setup... side key.

3. Press the Angular Units side key to select Degrees or Radians.

RSA3408A Option 29 User Manual

2-7

Operating Basics

Scaling the Graph

You can expand a waveform horizontally and vertically using the VIEW: SCALE key on the front panel (you cannot compress the original waveform). The scale setting affects only the display; it does not change the acquisition parameters such as span, center frequency, and reference level. Although the View Scale menu varies with the measurement items, it has commonly the following controls as shown in Figure 2-3.

Horizontal Scale.

Horizontal Start.

Vertical Scale.

Vertical Start.

Vertical Offset.

Vertical Stop.

Ver t i ca l S t o p

Sets the range of the horizontal axis.

Sets the minimum value (left edge) of the horizontal axis.

Sets the range of the vertical axis.

Sets the minimum value (bottom edge) of the vertical axis.

Sets the center value of the vertical axis.

Sets the maximum value (top edge) of the vertical axis.

Vertical Offset

Vertical Start

Horizontal Scale

Horizontal Start

Ver tica l S c ale

Figure 2-3: Definition of the View Scale menu items

Press the VIEW: SELECT key to select a view before scaling the graph using the SCALE key. Chapter 3, Reference, describes the View Scale menu for each

measurement item. Refer to the following sections:

 IEEE802.11a/b/g Analysis: View Format on page 3-11

 IEEE802.11n (nx1) Analysis: View Format on page 3-55

 IEEE802.11n MIMO (2x2) Analysis: View Format on page 3-102

2-8

RSA3408A Option 29 User Manual

Saving Measurement Results

You can save measurement results to files using the SAVE key on the front panel.

Operating Basics

Save Menu

NOTE.

This section provides information about file save specific to Option 29

WLAN analysis. For details on standard file operations, refer to the RSA3408A

User Manual.

The Save menu for the modulation measurements has the following controls.

Save State.

Save Data...

Saves the instrument settings.

Saves the input waveform (IQ data in the time domain) to a file in the

IQT format.

 All Blocks. Saves all the acquired blocks.

 Current Block. Saves the block currently displayed in the overview.

 Current Area. Saves the data in the analysis range.

Save Mainview Results.

802.11n nx1 and MIMO (2x2) analyses only. Saves the measurement results to a file in the CSV (Comma Separated Values) format. You can import the file into Microsoft Excel or other database systems. Refer to

Appendix B for the save format.

Submenu items for the transfer function and delay profile measurements:

 Trace 1. Saves Trace 1 to a specified file.

 Trace 2. Saves Trace 2 to a specified file.

 Trace 1 and 2. Saves Trace 1 and 2 to two files with the file names of “1” and

“2” added respectively to a specified name.

 All Data. MIMO (2x2) analysis only. Saves Trace 1 and 2 to a specified file in

all combinations of the Tx and Rx antennas.

 Packets Offset. Specifies the first packet to save. (See Figure 2-4.)

Range: −[(the number of packets in the analysis range) − 1] to 0. Zero (0) represents the latest packet.

 Number of Packets. Sets the number of packets to save. (See Figure 2-4.)

Range: 1 to [−(Packet Offset) + 1].

RSA3408A Option 29 User Manual

2-9

Operating Basics

Packets Offset

Packet

−

……

Saved to a file

Number of Packets

−

Figure 2-4: Setting packets to be saved

Submenu items for other than transfer function and delay profile measurements (MIMO (2x2) analysis only):

 Trace Data . Saves the displayed trace data to a specified file.

 All Data. Saves the trace data to a specified file in all combinations of the Tx

and Rx antennas.

2-10

RSA3408A Option 29 User Manual

Reference

IEEE802.11a/b/g Analysis

This section describes the basic operation of the IEEE802.11a/b/g analysis. You can access the measurement items by pressing DEMOD → Standard... → IEEE802.11a/b/g as shown in Figure 3-1.

MODE

S/A

DEMOD

TIME

Standard... IEEE802.11a/b/g

Figure 3-1: IEEE802.11a/b/g measurement menu

Measure menu items

Modulation measurement

EVM versus Time Power versus Time Constellation EVM versus SC Power versus SC SC Constellation Frequency Error OFDM Flatness OFDM Linearity Symbol Table

Power measurement

Spectrum Mask Transmit Power

RSA3408A Option 29 User Manual

3-1

IEEE802.11a/b/g Analysis

Basic Measurement Procedure

The basic measurement procedures are described for the modulation analysis and the power analysis.

Modulation Measurement

Follow these steps to perform the modulation measurement.

1. Press DEMOD → Standard... → IEEE 802.11a/b/g.

2. Set frequency and span appropriately using the FREQUENCY/CHANNEL and the SPAN keys. Refer to Setting Frequency and Span on page 2-3.

3. Set the amplitude appropriately using the AMPLITUDE key.

NOTE.

the red box at the center top of the screen. In this case, raise the reference level.

4. Press the TIMING key and set the timing parameters.

5. After acquiring measurement data, stop the data acquisition using the

6. Press the MEASURE key and select the measurement item.

7. Press MEAS SETUP → Analysis Parameter... to preset the parameters.

If the input signal level is too high, A/D OVERFLOW will be displayed in

Refer to Setting Timing Parameters on page 2-6.

RUN/STOP key.

For example, press the Power vs Time side key to observe power variance.

a. Press the Modulation Detection... side key and select the modulation type

(data rate). The default setting is AUTO.

b. Select the Synchronization and Equalization options as necessary.

3-2

For details on setting the Measurement Setup menu, refer to page 3-5.

8. Press MEAS SETUP → Analyze to start the analysis for the acquired data with the specified parameters.

If you cancel the analysis, press the Cancel-Back (top) side key.

9. Use the View menu to modify the displayed graph. For details on setting the views, refer to View Format on page 3-11.

RSA3408A Option 29 User Manual

IEEE802.11a/b/g Analysis

Power Measurement

The power analysis consists of Spectrum Mask and Transmit Power. Follow these steps to perform the power analysis.

1. Press DEMOD → Standard... → IEEE 802.11a/b/g.

2. Set frequency and span appropriately using the FREQUENCY/CHANNEL

and the SPAN keys. Refer to Setting Frequency and Span on page 2-3.

3. Set the amplitude appropriately using the AMPLITUDE key.

NOTE.

the red box at the center top of the screen. In this case, raise the reference level.

4. Transmit Power only. Press the TIMING key and set the timing parameters.

5. Press the MEASURE key and select the measurement item. For example,

6. Press the MEAS SETUP key and set the measurement parameters.

7. Use the View menu to modify the displayed graph.

If the input signal level is too high, A/D OVERFLOW will be displayed in

Refer to Setting Timing Parameters on page 2-6.

press the Spectrum Mask side key to observe the spectrum mask.

For details on setting the Measurement Setup menu, refer to page 3-4.

For details on setting the views, refer to View Format on page 3-11.

RSA3408A Option 29 User Manual

3-3

IEEE802.11a/b/g Analysis

Meas Setup Menu

Press the MEAS SETUP key to set the measurement parameters. The Meas Setup menu varies among the measurement items. Refer to the section shown in Tab le 3-1 .

Table 3-1: Measurement setup reference for the 802.11a/b/g analysis

Measurement item Reference section

Modulation measurements

EVM versus Time Power versus Time Constellation EVM versus SC Power versus SC SC Constellation Frequency Error OFDM Flatness OFDM Linearity Symbol Table

Power measurements

Spectrum Mask Measurement Setup for Spectrum Mask on page 3-9 Transmit Power Measurement Setup for Transmit Power on page 3-10

Measurement Setup for Modulation Measurements on page 3-5

3-4

RSA3408A Option 29 User Manual

Measurement Setup for Modulation Measurements

The Meas Setup menu for the modulation measurements has the following controls:

IEEE802.11a/b/g Analysis

Analyze

Analysis Parameter...

Performs the analysis for the input data in the range specified on the overview.

You need to set the analysis parameters before pressing the Analyze side key.

Modulation Detection...

Selects the demodulation type. If you select Auto, the

demodulation type will be determined dynamically by decoding the preamble.

Table 3-2: Modulation detection

Parameter Data rate Modulation 1st/2

AUTO (default) Auto Auto OFDM,64QAM(54Mbps) 54 Mbps 64QAM/OFDM 3/4 OFDM,64QAM(48Mbps) 48 Mbps 64QAM/OFDM 2/3 OFDM,16QAM(36Mbps) 36 Mbps 16QAM/OFDM 3/4 OFDM,16QAM(24Mbps) 24 Mbps 16QAM/OFDM 1/2 OFDM,QPSK(18Mbps) 18 Mbps QPSK/OFDM 3/4 OFDM,QPSK(12Mbps) 12 Mbps QPSK/OFDM 1/2 OFDM,BPSK(9Mbps) 9 Mbps BPSK/OFDM 3/4 OFDM,BPSK(6Mbps) 6 Mbps BPSK/OFDM 1/2 CCK(11Mbps) 11 Mbps CCK CCK(5.5Mbps) 5.5 Mbps CCK DSSS,DQPSK(2Mbps) 2 Mbps BPSK/PBCC DSSS,DBPSK(1Mbps) 1 Mbps QPSK/PBCC PBCC,8PSK(33Mbps) 33 Mbps DBPSK/DSSS PBCC,8PSK(22Mbps) 22 Mbps DQPSK/DSSS PBCC,QPSK(11Mbps) 11 Mbps DBPSK/DSSS PBCC,BPSK(5.5Mbps) 5.5 Mbps DQPSK/DSSS

Encoding rate

Synchronization.

 LT S. Default. Synchronizes with Long Training Symbol.

 GI. Synchronizes with Guard Interval.

Equalization.

long training symbol during the analysis.

 On. Default. Enables the data correction.

 Off. Disables the data correction.

RSA3408A Option 29 User Manual

Selects the synchronization method.

Determines whether to apply the data correction using the

3-5

IEEE802.11a/b/g Analysis

Select Subcarrier...

Subcarrier #

Symbol #

Selects subcarrier for a displayed line graph.

 Data + Pilot. Default. Displays the measurement results for data and pilot.

 Data. Displays the measurement results for data only.

 Pilot. Displays the measurement results for pilot only.

 Single Subcarrier. Displays the measurement results for the subcarrier

specified using the Subcarrier # side key below. This menu item is available when you specify one of the following formats for a measurement display.

 EVM versus Time

 Power versus Time

 Constellation

Specifies the subcarrier number when you select Single Subcarrier with the Select Subcarrier... side key above. Range:

−32 to +31.

Specifies the analysis symbol number for a measurement display when you select one of the following formats:

 EVM versus SC

 Power versus SC

 SC Constellation

 Symbol Table

NOTE.

For definition of the analysis symbol, refer to page 3-7.

The Select Subcarrier..., Subcarrier #, and Symbol # menu items are effective only in the measurements shown in Table 3-3.

Table 3-3: Submenu availability

Measure menu item Select Subcarrier... Subcarrier # Symbol #

EVM versus Time Power versus Time Constellation EVM versus SC Power versus SC SC Constellation Frequency Error OFDM Flatness OFDM Linearity Symbol Table

✓ ✓ ✓ ✓ ✓ ✓

✓ ✓ ✓

✓

3-6

RSA3408A Option 29 User Manual

IEEE802.11a/b/g Analysis

Definition of the Analysis Symbol.

In the modulation analysis, it is important to calculate average values of RMS voltage or center frequency error for enough time to get good analysis results. The length of a signal to calculate the RMS voltage or center frequency error is called “analysis symbol” in the WLAN analysis software. For example, frequency error by the analysis symbol is displayed on the center frequency error view. Although “symbol” is defined for OFDM in the 802.11a/g standard, “analysis symbol” is used in the WLAN analysis software taking the other modulation types into account.

The following views display the averaged values by analysis symbol for power, EVM, magnitude error, and phase error, respectively.

 Power versus Time

 EVM versus Time

 MagErr versus Time

 PhaseErr versus Time

The following views display analysis results of power, EVM, magnitude error, and phase error, respectively for each data point, chip, or subcarrier contained in one analysis symbol.

 Power versus SC

 EVM versus SC

 MagErr versus SC

 PhaseErr versus SC

The length of an analysis symbol depends on the modulation type as follows:

Table 3-4: Length of an analysis symbol, IEEE802.11a/g

Part of a signal Type of the signal Length of an analysis symbol

Data part OFDM 80 sample points

DSSS 88 chips CCK 80 chips PBCC 80 data points

Preamble/Header part Short OFDM training symbol 16 sample points

Long OFDM training symbol 160 sample points PLCP preamble 1584 chips Short PLCP preamble 792 chips PLCP header 528 chips Short PLCP header 264 chips

RSA3408A Option 29 User Manual

3-7

IEEE802.11a/b/g Analysis

Preamble

Modulation Type

Display Filter...

Selects the modulation type(s) to display the measurement results on the screen. The results and graph are shown only for the types set to On.

Select cell to edit.

Selects an item to change the on/off setting in the table on screen. The table consists of six blocks as shown in Figure 3-2. The selected item appears on the second side key where you can turn it on or off.

All Preambles On/Off.

All Data On/Off.

Turns on or off all the preambles.

Turns on or off all the data.

Select an item to change the on/off setting.

Turn on or off the selected item.

Turn on or off all the preambles.

Turn on or off all the data.

Data

IEEE 802.11a IEEE 802.11b IEEE 802.11g

Figure 3-2: Modulation Type Display Filter setting

3-8

RSA3408A Option 29 User Manual

Measurement Setup for Spectrum Mask

The Meas Setup menu for the Spectrum Mask has the following controls:

IEEE802.11a/b/g Analysis

Spectrum Mask

Selects the spectrum mask specified in the IEEE802.11a/b standard. (See Figure 3-3.)

 DSSS (default)

 OFDM

DSSS (IEEE802.11b)

-22

Power spectral density

-11 0 11 22

0 dB

Transmit spectrum mask

-30 dB

-50 dB

Frequency (MHz)

Unfiltered Sinx/x

OFDM (IEEE802.11a)

Figure 3-3: IEEE802.11a/b spectrum mask

RSA3408A Option 29 User Manual

Power spectral density

-30 -20 -11

0 dB

Transmit spectrum mask

-20 dB

-28 dB

-45 dB

-9

Typical signal spectrum

302011

Frequency (MHz)

3-9

IEEE802.11a/b/g Analysis

Measurement Setup for Transmit Power

The Meas Setup menu for the Transmit Power has the following controls:

Transmit Power

Burst Select

Selects the measurement: Transmit Power On or Down. The measurement results for the selected item are displayed on the screen.

 On. Selects the Transmit Power On measurement.

 Down. Selects the Transmit Power Down measurement.

Specifies the index of a burst to display the measurement results.

Range: from (the number of all bursts in one acquisition block) −1 to 0. 0 (zero) indicates the latest burst.

The specified burst is indicated with the green bar in the Timing field on the overview as shown in Figure 3-4.

Overview

The burst specified with Burst Select is indicated with the green bar.

3-10

Figure 3-4: Burst indicator on the overview

RSA3408A Option 29 User Manual

View Format

IEEE802.11a/b/g Analysis

This section provides information about the view formats of the IEEE802.11a/b/g analysis. It consists of two parts:

 View Format for Modulation Measurements

 View Format for Power Measurements

Selecting View Content

You can change the view content with the VIEW: DEFINE key on the front panel. The view contents depend on the measurement items as shown in Table 3-5. In the EVM measurement, you can change the measurement content using the VIEW: SCALE key.

Table 3-5: View content selection, IEEE802.11a/b/g

→

VIEW: DEFINE

Measurement item

Modulation analysis

EVM versus Time

Power versus Time Constellation Vector / Constellation EVM versus SC EVM

Power versus SC SC Constellation Vector / Constellation Frequency Error OFDM Flatness OFDM Linearity Vector / Dot Symbol Table -

Power analysis

Spectrum Mask - - Transmit Power Waveform (default)

Overview content

Waveform (default) Spectrogram

Spectrogram

VIEW: DEFINE → Subview content

Spectrum (default) Constellation EVM versus Time Power versus Time SC Constellation EVM versus SC Power versus SC Frequency Error OFDM Flatness OFDM Linearity Symbol Table

Spectrum (default) Power On / Down

VIEW: SCALE → Measurement content

EVM Mag Err Phase Err

Mag Err Phase Err

NOTE.

(Spectrum Analysis) mode. Refer to the RSA3408A User Manual.

RSA3408A Option 29 User Manual

The View Define menu for Spectrum Mask is the same as in the S/A

3-11

IEEE802.11a/b/g Analysis

View Format for Modulation Measurements

EVM versus Time

Measurement readout

The main view shows the EVM of carriers, or one or all subcarriers in a line graph, as shown in Figure 3-5. The vertical axis represents EVM in percent and the horizontal axis represents time in seconds.

Marker readout

• Horizontal value: Time (s)

• Vertical value: EVM (%)

Modulation type

The Select Subcarrier setting in the Meas Setup menu

Subcarrier number setting in the Meas Setup menu (displayed when Select Subcarrier is set to Single Subcarrier)

Preamble indicator: “Preamble On” is displayed when one or more preambles are enabled in Modulation Type Display Filter of the Meas Setup menu.

Figure 3-5: EVM versus Time (main view)

3-12

The following table shows the measurement readout that is displayed on the left in the main view:

Measurement readout Unit Description

Total Symbol - Total number of analysis symbols EVM (rms) %, dB RMS value of EVM

(Peak) %, dB Peak value of EVM (@Time) s The peak time relative to the last data point

Mag Error (rms) %, dB RMS value of Mag Error

(Peak) %, dB Peak value of Mag Error (@Time) s The peak time relative to the last data point

degrees or

Phase Error (rms)

(Peak) (@Time) s The peak time relative to the last data point

radians RMS value of Phase Error degrees or

radians Peak value of Phase Error

RSA3408A Option 29 User Manual

IEEE802.11a/b/g Analysis

View Scale Menu.

The View Scale menu for EVM versus Time has the following

controls:

Aut o Scale. Sets the start value and the scale of the vertical axis automatically to fit the waveform to the screen.

Horizontal Scale. Sets the range of the horizontal axis (time).

Horizontal Start. Sets the minimum value (left edge) of the horizontal axis.

NOTE.

The horizontal display range must be within the analysis range specified

using the Timing menu (refer to page 2-6).

Ver t ic al S c a l e . Sets the range of the vertical axis. Refer to Table 3-6 for the setting range.

Vertical Start. When the measurement content is EVM, sets the minimum value (bottom edge) of the vertical axis. Refer to Table 3-6 for the setting range.

Vertical Offset. When the measurement content is Mag Error or Phase Error, sets the center value ((maximum + minimum) / 2) of the vertical axis. Refer to Table 3-6 for the setting range.

Table 3-6: Vertical setting range

Measurement Vertical Scale Vertical Start Vertical Offset

EVM 100 Magnitude error 200 Phase error 450

to 100%

to 200% -

to 450

−

100 to 100% -

−

200 to 200%

−

450 to 450

Full Scale. Sets the scale of vertical axis to the default full-scale value.

Measurement Content... Selects how to display the vertical axis:

 EVM. Represents the vertical axis with EVM (Error Vector Magnitude).

 Mag Error. Represents the vertical axis with magnitude error.

 Phase Error. Represents the vertical axis with phase error.

RSA3408A Option 29 User Manual

3-13

IEEE802.11a/b/g Analysis

MagErr versus Time

Measurement readout

The main view shows the magnitude error of carriers, or one or all subcarriers in a line graph, as shown in Figure 3-6. The vertical axis represents magnitude error in percent and the horizontal axis represents time in seconds.

Marker readout

• Horizontal value: Time (s)

• Vertical value: Magnitude error (%)

Modulation type

The Select Subcarrier setting in the Meas Setup menu

Subcarrier number setting in the Meas Setup menu (displayed when Select Subcarrier is set to Single Subcarrier)

Preamble indicator: “Preamble On” is displayed when one or more preambles are enabled in Modulation Type Display Filter of the Meas Setup menu.

Figure 3-6: MagErr versus Time (main view)

The measurement readout is the same as in EVM versus Time, shown in the table on page 3-12.

View Scale Menu.

Refer to the View Scale menu of EVM versus Time on page 3-13.

3-14

RSA3408A Option 29 User Manual

IEEE802.11a/b/g Analysis

PhaseErr versus Time

Measurement readout

The main view shows the Phase Error of carriers, or one or all subcarriers in a line graph, as shown in Figure 3-7. The vertical axis represents phase error in degrees or radians and the horizontal axis represents time in s.

Marker readout

• Horizontal value: Time (s)

• Vertical value: Phase error (degrees / radians)

Modulation type

The Select Subcarrier setting in the Meas Setup menu

Subcarrier number setting in the Meas Setup menu (displayed when Select Subcarrier is set to Single Subcarrier)

Preamble indicator: “Preamble On” is displayed when one or more preambles are enabled in Modulation Type Display Filter of the Meas Setup menu.

Figure 3-7: PhaseErr versus Time (main view)

The measurement readout is the same as in EVM versus Time, shown in the table on page 3-12.

View Scale Menu.

Refer to the View Scale menu of EVM versus Time on page 3-13.

RSA3408A Option 29 User Manual

3-15

IEEE802.11a/b/g Analysis

Power versus Time

Measurement readout

The main view shows the power of carriers, or one or all subcarriers in a line graph, as shown in Figure 3-8. The vertical axis represents power in dBm and the horizontal axis represents time in seconds.

Marker readout

• Horizontal value: Time (s)

• Vertical value: Power (dBm)

Modulation type

The Select Subcarrier setting in the Meas Setup menu

Subcarrier number setting in the Meas Setup menu (displayed when Select Subcarrier is set to Single Subcarrier)

Preamble indicator: “Preamble On” is displayed when one or more preambles are enabled in Modulation Type Display Filter of the Meas Setup menu.

Figure 3-8: Power versus Time (main view)

The following table shows the measurement readout that is displayed on the left in the main view:

Measurement readout Unit Description

Total Symbol - Total number of analysis symbols Power (rms) dBm, W RMS power of one or all subcarriers

(Peak) dBm, W Peak power of one or all subcarriers (@Time) s The peak time relative to the last data point

3-16

RSA3408A Option 29 User Manual

IEEE802.11a/b/g Analysis

View Scale Menu.

The View Scale menu for Power versus Time has the following

controls:

Aut o Scale. Sets the start value and the scale of the vertical axis automatically to fit the waveform to the screen.

Horizontal Scale. Sets the range of the horizontal axis (time).

Horizontal Start. Sets the minimum value (left edge) of the horizontal axis.

NOTE.

The horizontal display range must be within the analysis range specified

using the Timing menu (refer to page 2-6).

Ver t ic al S c a l e . Sets the range of the vertical axis. Range: 50 µ to 50 dB.

Ver t ic al S t o p . Sets the maximum value (top edge) of the vertical axis. Range: −50 to 50 dB.

Full Scale. Sets the scale of the vertical axis to the default full-scale value.

RSA3408A Option 29 User Manual

3-17

IEEE802.11a/b/g Analysis

Constellation

Measurement readout

The main view displays the constellation of one or all subcarriers in a rectangular coordinates graph, as shown in Figure 3-9. The horizontal axis represents I and the vertical axis represents Q.

Marker readout

• Time (s)

• Magnitude

• Phase (degrees / radians)

Modulation type

The Select Subcarrier setting in the Meas Setup menu

Subcarrier number setting in the Meas Setup menu (displayed when Select Subcarrier is set to Single Subcarrier)

Preamble indicator: “Preamble On” is displayed when one or more preambles are enabled in Modulation Type Display Filter of the Meas Setup menu.

Figure 3-9: Constellation (main view)

The measurement readout is the same as in EVM versus Time, shown in the table on page 3-12.

View Scale Menu.

The View Scale menu for the constellation has the following

controls:

Measurement Content... Selects vector or constellation display.

 Vec tor. Selects vector display. A signal represented by phase and amplitude is

displayed in polar coordinate or IQ diagram. The red point indicates the symbol position of the measured signal, and the yellow trace indicates the locus of the signal between symbols.

 Constellation. Selects constellation display. It is the same as the vector

display, except that only symbols of the measured signal are indicated in red, and the locus between symbols is not shown. The cross marks indicate the symbol positions of an ideal signal.

3-18

RSA3408A Option 29 User Manual

IEEE802.11a/b/g Analysis

EVM versus SC

Measurement readout

The displayed graph automatically toggles depending on the modulation format (OFDM or Non-OFDM).

OFDM.

The bar graph in the main view shows the EVM of each subcarrier for one

analysis symbol specified using the Symbol # side key in the Meas Setup menu, as shown in Figure 3-10. The vertical axis represents EVM in percent and the horizontal axis represents subcarrier number ranging from − 32 to +31.

Marker readout

• Horizontal value: Subcarrier number

• Vertical value: EVM (%)

Modulation type

Symbol number setting in the Meas Setup menu

Figure 3-10: EVM versus SC (main view)

The following table shows the measurement readout that is displayed on the left in the main view:

Measurement readout Unit Description

Total Symbol - Total number of analysis symbols EVM (rms) %, dB RMS value of EVM

(Peak) %, dB Peak value of EVM (@SC_No.) - The subcarrier number at the peak

Mag Error (rms) %, dB RMS value of Mag Error

(Peak) %, dB Peak value of Mag Error (@SC_No.) - The subcarrier number at the peak

degrees or

Phase Error (rms)

(Peak) (@SC_No.) - The subcarrier number at the peak

radians RMS value of Phase Error degrees or

radians Peak value of Phase Error

RSA3408A Option 29 User Manual

3-19

IEEE802.11a/b/g Analysis

View Scale Menu.

The View Scale menu in EVM versus SC for OFDM has the

following controls:

Aut o Scale. Sets the start value and the scale of the vertical axis automatically to fit the waveform to the screen.

Horizontal Scale. Sets the range of the horizontal axis (subcarrier number). Range: 8 to 64.

Horizontal Start. Sets the minimum value (left edge) of the horizontal axis. Range: −32 to 24.

Ver t ic al S c a l e . Sets the range of the vertical axis. Refer to Table 3-7 for the setting range.

Vertical Start. When the measurement content is EVM, sets the minimum value (bottom edge) of the vertical axis. Refer to Table 3-7 for the setting range.

Vertical Offset. When the measurement content is Mag Error or Phase Error, sets the center value ((maximum + minimum) / 2) of the vertical axis. Refer to Table 3-7 for the setting range.

Table 3-7: Vertical setting range

Measurement Vertical Scale Vertical Start Vertical Offset

EVM 100 Magnitude error 200 Phase error 450

to 100%

to 200% -

to 450

−

100 to 100% -

−

200 to 200%

−

450 to 450

Full Scale. Sets the scale of vertical axis to the default full-scale value.

Measurement Content... Selects how to display the vertical axis:

 EVM. Represents the vertical axis with EVM (Error Vector Magnitude).

 Mag Error. Represents the vertical axis with magnitude error.

 Phase Error. Represents the vertical axis with phase error.

3-20

RSA3408A Option 29 User Manual

IEEE802.11a/b/g Analysis

Non-OFDM.

bar graph, as shown in Figure 3-11. The vertical axis represents EVM in percent and the horizontal axis represents time in s.

Measurement readout

Figure 3-11: EVM versus Time (main view)

The measurement readout is the same as in EVM versus Time, shown in the table on page 3-12.

The main view displays the EVM of carriers by analysis symbol in a

Marker readout

• Horizontal value: Time (s)

• Vertical value: EVM (%)

Modulation type

Symbol number setting in the Meas Setup menu

View Scale Menu.

The View Scale menu in EVM versus SC for Non-OFDM has the

same controls as in EVM versus Time. Refer to page 3-13.

RSA3408A Option 29 User Manual

3-21

IEEE802.11a/b/g Analysis

MagErr versus SC

Measurement readout

The displayed graph automatically toggles depending on the modulation format (OFDM or Non-OFDM).

OFDM.

The bar graph in the main view shows the magnitude error of each

subcarrier for one analysis symbol specified using the Symbol # side key in the Meas Setup menu, as shown in Figure 3-12. The vertical axis represents magnitude error in percent and the horizontal axis represents the subcarrier wave number ranging from −32 to +31.

Marker readout

• Horizontal value: Subcarrier number

• Vertical value: Magnitude error (%)

Modulation type

Symbol number setting in the Meas Setup menu

Figure 3-12: MagErr versus SC (main view)

The measurement readout is the same as in EVM versus SC, shown in the table on page 3-19.

View Scale Menu.

Refer to the View Scale menu of EVM versus SC on page 3-20.

3-22

RSA3408A Option 29 User Manual

IEEE802.11a/b/g Analysis

Non-OFDM.

symbol in a bar graph, as shown in Figure 3-13. The vertical axis represents the magnitude error in percent and the horizontal axis represents time in seconds.

Measurement readout

Figure 3-13: MagErr versus Time (main view)

The measurement readout is the same as in EVM versus Time, shown in the table on page 3-12.

The main view displays the magnitude error of carriers by analysis

Marker readout

• Horizontal value: Time (s)

• Vertical value: Magnitude error (%)

Modulation type

Symbol number setting in the Meas Setup menu

View Scale Menu.

The View Scale menu in MagErr versus SC for Non-OFDM has

the same controls as in EVM versus Time. Refer to page 3-13.

RSA3408A Option 29 User Manual

3-23

IEEE802.11a/b/g Analysis

PhaseErr versus SC

Measurement readout

The displayed graph automatically toggles depending on the modulation format (OFDM or Non-OFDM).

OFDM.

The bar graph in the main view shows the phase error of each subcarrier for

one analysis symbol specified using the Symbol # side key in the Meas Setup menu, as shown in Figure 3-14. The vertical axis represents phase error in degrees or radians and the horizontal axis represents the subcarrier wave number ranging from −32 to +31.

Marker readout

• Horizontal value: Subcarrier number

• Vertical value: Phase error (

degrees / radians

Modulation type

Symbol number setting in the Meas Setup menu

)

Figure 3-14: PhaseErr versus SC (main view)

The measurement readout is the same as in EVM versus SC, shown in the table on page 3-19.

View Scale Menu.

Refer to the View Scale menu of EVM versus SC on page 3-20.

3-24

RSA3408A Option 29 User Manual

IEEE802.11a/b/g Analysis

Non-OFDM.

in a bar graph, as shown in Figure 3-15. The vertical axis represents the phase error in degrees or radians and the horizontal axis represents time in s.

Measurement readout

Figure 3-15: PhaseErr versus Time (main view)

The measurement readout is the same as in EVM versus Time, shown in the table on page 3-12.

The main view displays the phase error of carriers by analysis symbol

Marker readout

• Horizontal value: Time (s)

• Ver tical value: Phase error (degrees / radians)

Modulation type

Symbol number setting in the Meas Setup menu

View Scale Menu.

The View Scale menu in PhaseErr versus SC for Non-OFDM has

the same controls as in EVM versus Time. Refer to page 3-13.

RSA3408A Option 29 User Manual

3-25

IEEE802.11a/b/g Analysis

Power versus SC

Measurement readout

The displayed graph automatically toggles depending on the modulation format (OFDM or Non-OFDM).

OFDM.

The bar graph in the main view displays the power of each subcarrier for

one analysis symbol specified using the Symbol # side key in the Meas Setup menu, as shown in Figure 3-16. The vertical axis represents power in dBm and the horizontal axis represents the subcarrier number ranging from −32 to +31.

Marker readout

• Horizontal value: Subcarrier number

• Vertical value: Power (dBm)

Modulation type

Symbol number setting in the Meas Setup menu

Figure 3-16: Power versus SC (main view)

The following table shows the measurement readout that is displayed on the left in the main view:

Measurement readout Unit Description

Total Symbol - Total number of analysis symbols Power (rms) dBm, W RMS power of one or all subcarriers

(Peak) dBm, W Peak power of one or all subcarriers (@SC_No.) - Subcarrier number at the peak

3-26

RSA3408A Option 29 User Manual

IEEE802.11a/b/g Analysis

View Scale Menu.

following controls:

Aut o Scale. Sets the start value and the scale of the vertical axis automatically to fit the waveform to the screen.

Horizontal Scale. Sets the range of the horizontal axis (subcarrier number). Range: 8 to 64.

Horizontal Start. Sets the minimum value (left edge) of the horizontal axis. Range: −32 to 24.

Ver t ic al S c a l e . Sets the range of the vertical axis. Range: 50 µ to 50 dB.

Ver t ic al S t o p . Sets the maximum value (top edge) of the vertical axis. Range: −50 to 50 dBm.

Full Scale. Sets the scale of the vertical axis to the default full-scale value.

The View Scale menu in Power versus SC for OFDM has the

RSA3408A Option 29 User Manual

3-27

IEEE802.11a/b/g Analysis

Non-OFDM.

bar graph, as shown in Figure 3-17. The vertical axis represents power in dBm and the horizontal axis represents time in seconds.

Measurement readout

Figure 3-17: Power versus Time (main view)

The following table shows the measurement readout that is displayed on the left in the main view:

The main view displays the power of carriers by analysis symbol in a

Marker readout

• Horizontal value: Time (s)

• Vertical value: Power (dBm)

Modulation type

Symbol number setting in the Meas Setup menu

Measurement readout Unit Description

Total Symbol - Total number of analysis symbols Power (rms) dBm, W RMS power of one or all subcarriers

(Peak) dBm, W Peak power of one or all subcarriers (@Time) s The peak time relative to the last data point

View Scale Menu.

The View Scale menu in Power versus SC for Non-OFDM has

the same controls as in Power versus Time. Refer to page 3-17.

3-28

RSA3408A Option 29 User Manual

IEEE802.11a/b/g Analysis

SC Constellation

Measurement readout

The displayed graph automatically toggles depending on the modulation format (OFDM or Non-OFDM).

OFDM.

The main view displays the constellation of subcarriers in a rectangular coordinate graph for an analysis symbol, as shown in Figure 3-18. The horizontal axis represents I and the vertical axis represents Q.

Marker readout

• Symbol number

• Magnitude

• Phase (degrees / radians)

Modulation type

Symbol number setting in the Meas Setup menu

Figure 3-18: Symbol Constellation (main view)

The measurement readout is the same as in EVM versus SC, shown in the table on page 3-19.

View Scale Menu.

Same as in Constellation. Refer to page 3-18.

RSA3408A Option 29 User Manual

3-29

IEEE802.11a/b/g Analysis

Non-OFDM.

rectangular coordinate graph for an analysis symbol, as shown in Figure 3-19. The horizontal axis represents I, and the vertical axis represents Q.

Measurement readout

Figure 3-19: Symbol Constellation (main view)

The measurement readout is the same as in EVM versus Time, shown in the table on page 3-12.

The main view displays the constellation of carriers in a

Marker readout

• Symbol number

• Magnitude

• Phase (degrees / radians)

Modulation type

Symbol number setting in the Meas Setup menu

View Scale Menu.

Same as in Constellation. Refer to page 3-18.

3-30

RSA3408A Option 29 User Manual

IEEE802.11a/b/g Analysis

Frequency Error

The main view displays the center frequency deviation over time in a line graph, as shown in Figure 3-20. The vertical axis represents frequency error in kHz, and the horizontal axis represents time in seconds.

Marker readout

Measurement readout

• Horizontal value: Time (s)

• Vertical value: Frequency error (Hz)

Modulation type

Figure 3-20: Frequency error (main view)

The following table shows the measurement readout that is displayed on the left in the main view:

Measurement readout Unit Description

Total Symbol - Total number of analysis symbols Center Frequency Error (rms) kHz RMS frequency error

(Peak) kHz Peak frequency error (@Time) s The peak time relative to the last data point

RSA3408A Option 29 User Manual

3-31

IEEE802.11a/b/g Analysis

View Scale Menu.

The View Scale menu for Frequency Error has the following

controls:

Aut o Scale. Sets the start value and the scale of the vertical axis automatically to fit the waveform to the screen.

Horizontal Scale. Sets the range of the horizontal axis (time).

Horizontal Start. Sets the minimum value (left edge) of the horizontal axis.

NOTE.

The horizontal display range must be within the analysis range specified

using the Timing menu (refer to page 2-6).

Ver t ic al S c a l e . Sets the range of the vertical axis (frequency). Range: 500 m to 500 kHz.

Ver t ic al O f f s e t. Sets the maximum value (top edge) of the vertical axis. Range: −500 k to 500 kHz.

Full Scale. Sets the scale of the vertical axis to the default full-scale value.

3-32

RSA3408A Option 29 User Manual

IEEE802.11a/b/g Analysis

OFDM Flatness

The main view displays each subcarrier wave flatness in a bar graph, as shown in Figure 3-21. The vertical axis represents the deviation power of average energy in dB, and the horizontal axis represents subcarrier wave number ranging from

−32 to +31.

Marker readout

Measurement readout

• Horizontal value: Subcarrier number

• Vertical value: Power (dBm)

Figure 3-21: OFDM flatness (main view)

Verify that the measurement results of the bar graph fall within the threshold level displayed with two red lines.

The following table shows the measurement readout that is displayed on the left in the main view:

Measurement readout Unit Description

Total Symbol - Total number of analysis symbols Center Frequency Leakage dB Carrier leakage power (<2 dB in IEEE802.11a standard)

RSA3408A Option 29 User Manual

3-33

IEEE802.11a/b/g Analysis

View Scale Menu.

controls:

Aut o Scale. Sets the start value and the scale of the vertical axis automatically to fit the waveform to the screen.

Horizontal Scale. Sets the range of the horizontal axis (subcarrier number). Range: 8 to 64.

Horizontal Start. Sets the minimum value (left edge) of the horizontal axis. Range: −32 to 24.

Ver t ic al S c a l e . Sets the range of the vertical axis. Range: 100 µ to 100 dB.

Ver t ic al S t o p . Sets the maximum value (top edge) of the vertical axis. Range: −150 to 50 dB.

Full Scale. Sets the scale of the vertical axis to the default full-scale value.

The View Scale menu for OFDM Flatness has the following

3-34

RSA3408A Option 29 User Manual

IEEE802.11a/b/g Analysis

OFDM Linearity

The main view displays the linearity of OFDM modulation in a line graph, as shown in Figure 3-22. The vertical axis represents actual measurement values in mW, and the horizontal axis represents the ideal values in mW.

Marker readout

• Marker position (set with Marker Setup → Marker X Position)

Measurement readout

• Horizontal value: Reference power (mW)

• Vertical value: Measurement power (mW)

The blue line represents the ideal line.

Figure 3-22: OFDM linearity (main view)

The measurement readout shows only the total number of analysis symbols.

View Scale Menu.

The View Scale menu for OFDM Linearity has the following

controls:

Measurement Content... Selects vector or dot display.

 Vec tor. Displays yellow lines between the dots (default).

 Dot. Displays the calculated result as a series of red dots.

The measurement results are displayed with the horizontal and vertical axes scaled automatically to fit the graph to the screen.

RSA3408A Option 29 User Manual

3-35

IEEE802.11a/b/g Analysis

Symbol Table

The main view displays the symbol table, as shown in Figure 3-23. The table can be displayed with binary, octal, or hexadecimal digits.

Marker readout

Measurement readout

• Symbol number

• Symbol value

Figure 3-23: Symbol table (main view)

The measurement readout shows only the total number of analysis symbols.

View Scale Menu.

The View Scale menu for Symbol Table has the following

controls:

Radix. Selects the radix for displaying the table:

 Hex. Hexadecimal digit

 Oct. Octal digit

 Bin. Default. Binary digit

Hex and Oct indicate values of binary data string in units of modulation symbol.

3-36

RSA3408A Option 29 User Manual

View Format for Power Measurement

This subsection describes all view formats for power analysis.

IEEE802.11a/b/g Analysis

Spectrum Mask

The spectrum mask measurement verifies that the base station is not transmitting excessive power outside of its designated channel.

OFDM.

shown in Figure 3-24. The vertical axis represents power in dBm and the horizontal axis represents frequency in Hz.

The screen displays the spectrum waveform and mask in a line graph, as

Marker readout

• Frequency (Hz)

• Power (dBm)

Figure 3-24: Spectrum mask (OFDM)

Verify that the measurement results (line graph) fall within the threshold level. This view does not display the measurement readouts.

RSA3408A Option 29 User Manual

3-37

IEEE802.11a/b/g Analysis

View Scale Menu.

following controls:

Aut o Scale. Sets the start value and the scale of the vertical axis automatically to fit the waveform to the screen.

Horizontal Scale. Sets the scale of the horizontal axis (frequency).

Horizontal Start. Sets the minimum value (left edge) of the horizontal axis.

Ver t ic al S c a l e . Sets the scale of the vertical axis (power).

Range: 100 µ to 100 dB.

Ver t ic al S t o p . Sets the maximum value (top edge) of the vertical axis. Range: −100 to 100 dBm.

Full Scale. Sets the scale of the vertical axis to the default full-scale value.

The View Scale menu in Spectrum Mask for OFDM has the

3-38

RSA3408A Option 29 User Manual

IEEE802.11a/b/g Analysis

Non-OFDM.

The screen displays the spectrum waveform and mask in a line graph, as shown in Figure 3-25. The vertical axis represents power in dBm and the horizontal axis represents frequency in Hz.

Marker readout

• Frequency (Hz)

• Power (dBm)

Figure 3-25: Spectrum mask (DSSS)

Verify that the measurement results of the line graph fall within the threshold level. This view does not display the measurement readouts.

View Scale Menu.

The View Scale menu in Spectrum Mask for Non-OFDM has the

same controls as for OFDM. Refer to page 3-38.

RSA3408A Option 29 User Manual

3-39

IEEE802.11a/b/g Analysis

Transmit Power

Displays the transmit power on/down ramp in a line graph with the standard mask.

NOTE.

On.

The transmit power measurement handles non-OFDM signals.

The main view displays the transmit power-on ramp in a line graph.

The vertical axis represents power in watts and the horizontal axis represents time in seconds.

Marker readout

• Horizontal value: Time (µs)

Measurement readout

• Vertical value: Power (mW)

Figure 3-26: Transmit power on (main view)

Verify that the measurement results (line graph) fall within the threshold level.

The following table shows the measurement readout that is displayed on the left in the main view:

Measurement readout Unit Description

Power On s Transmit power-on ramp from 10 to 90% Power Down s Transmit power-down ramp from 90 to 10%

3-40

RSA3408A Option 29 User Manual

IEEE802.11a/b/g Analysis

Figure 3-27 shows the IEEE802.11b standard for the transmit power-on ramp.

Transmit

power

output

Max Tx power

90% max

10% max

01234 Time (

Figure 3-27: IEEE802.11b Transmit power-on ramp

View Scale Menu.

The View Scale menu for Transmit Power On has the following

controls:

Aut o Scale. Sets the start value and the scale of the vertical axis automatically to fit the waveform to the screen.

Horizontal Scale. Sets the range of the horizontal axis (time).

Horizontal Start. Sets the minimum value (left edge) of the horizontal axis.

NOTE.

The horizontal display range must be within the analysis range specified

using the Timing menu (refer to page 2-6).

Ver t ic al S c a l e . Sets the range of the vertical axis (power). Range: 800 p to 800 µW.

Ver t ic al S t o p . Sets the maximum value (top edge) of the vertical axis. Range: 0 to 1.6 mW.

Full Scale. Sets the scale of the vertical axis to the default full-scale value.

RSA3408A Option 29 User Manual

3-41

IEEE802.11a/b/g Analysis

Down.

The main view displays the transmit power-down ramp in a line graph. The vertical axis represents power in watts and the horizontal axis represents time in seconds.

Marker readout

• Horizontal value: Time (µs)

Measurement readout

• Vertical value: Power (mW)

Figure 3-28: Transmit power down (main view)

Verify that the measurement results (line graph) fall within the threshold level. The readout is the same as Transmit Power-On. Refer to page 3-40.

Figure 3-29 shows the IEEE802.11b standard for the transmit power-down ramp.

Transmit

power

output

01234 Time (

Max Tx power

90% max

10% max

Figure 3-29: IEEE802.11b Transmit power-down ramp

3-42

View Scale Menu.

The View Scale menu for Transmit Power Down has the same

controls as for Transmit Power On. Refer to page 3-41.

RSA3408A Option 29 User Manual

802.11n (nx1) Analysis

This section describes the basic operation of the IEEE802.11n (nx1, Multi-Input Single-Output) analysis. You can access the measurement items by pressing DEMOD → Standard... → 802.11n (nx1) as shown in Figure 3-30.

NOTE.

The 802.11n (nx1) analysis includes the 1x1 (SISO: Single-Input Single-Output) and the 2x1 (MISO: Multi-Input Single-Output) measurements. The measurements other than Transfer Function and Delay Profile are for SISO only.

MODE

S/A

DEMOD

TIME

Standard... 802.11n (nx1)

Measure menu items

Modulation measurement

Transfer Function (Amp) Transfer Function (Phase) Delay Profile

EVM versus Time Power ver sus T ime Constellation EVM versus SC Power ver sus S C SC Constellation Frequency Error OFDM Flatness OFDM Linearity Symbol Table

Power measurement

Spectrum Mask

SISO (1x1) only

Figure 3-30: IEEE

While SISO is a traditional one-to-one communication method, MISO is a many-to-one system for improving the communication speed. The next section explains how the analyzer processes data in MISO (2x1).

RSA3408A Option 29 User Manual

802.11

n (nx1) measurement menu

3-43

802.11n (nx1) Analysis

Data Process Flow for MISO (2x1)

Figure 3-31 shows the data process flow in MISO (2x1). Packet 1 and 2 transmitted from Tx antenna 1 and 2 respectively are received by an Rx antenna. Packet 1 and 2 acquired by the analyzer are processed to extract LTF (Long Training Field). Then, the transfer function is calculated using the LTF parts. For MISO (2x1), two transfer functions are obtained according to the combination of the Tx and Rx antennas so the delay profile as well as the amplitude and phase transfer functions can be observed on the screen.

Tx Antenna 1 Tx Antenna 2

Tx1 Packet Tx2 Packet

LT FData 1 LT FData 2

Rx Antenna

RSA3408A

Acquired packets

LT F

Processed in the analyzer

Measurement and display

• Transfer function (Amplitude / Phase)

• Delay profile

Figure 3-31: Data process flow for MISO (2x1)

* Abbr.

LTF: Long Training Field. TFm: Transfer Function from Tx antenna m to Rx antenna.

Transfer Functions (TF) calculation

TF1

TF2

3-44

RSA3408A Option 29 User Manual

Basic Measurement Procedure

The basic measurement procedures are described for the modulation analysis and the power analysis.

802.11n (nx1) Analysis

Modulation Measurement

Do the following steps to perform the modulation measurement.

1. Press DEMOD → Standard... → 802.11n (nx1).

2. Set frequency and span appropriately using the FREQUENCY/CHANNEL

and the SPAN keys. Refer to Setting Frequency and Span on page 2-3.

3. Set the amplitude appropriately using the AMPLITUDE key.

NOTE.

the red box at the center top of the screen. In this case, raise the reference level.

4. Press the TIMING key and set the timing parameters.

5. After acquiring measurement data, stop the data acquisition using the

6. Press the MEASURE key and select a measurement item.

7. Press MEAS SETUP to set the measurement parameters.

8. Press MEAS SETUP → Analyze to start the analysis for the acquired data

If the input signal level is too high, A/D OVERFLOW will be displayed in

Refer to Setting Timing Parameters on page 2-6.

RUN/STOP key.

For example, press the Transfer Function (Amp) side key to observe the amplitude transfer function.

For details on setting the Measurement Setup menu, refer to page 3-47.

with the specified parameters.

9. Use the View menu to modify the displayed graph.

RSA3408A Option 29 User Manual

If you cancel the analysis, press the Cancel-Back (top) side key.

For details on setting the views, refer to View Format on page 3-55.

3-45

802.11n (nx1) Analysis

Power Measurement

Meas Setup Menu

The power analysis includes only the Spectrum Mask measurement. Do the following steps to perform the measurement.

1. Press DEMOD → Standard... → 802.11n (nx1).

2. Set frequency and span appropriately using the FREQUENCY/CHANNEL and the SPAN keys. Refer to Setting Frequency and Span on page 2-3.

3. Set the amplitude appropriately using the AMPLITUDE key.

NOTE.

If the input signal level is too high, A/D OVERFLOW will be displayed in

the red box at the center top of the screen. In this case, raise the reference level.

4. Press the MEASURE → Spectrum Mask to observe the spectrum mask.

5. Press the MEAS SETUP key and set the measurement parameters.

For details on setting the Measurement Setup menu, refer to page 3-52.

6. Use the View menu to modify the displayed graph.

For details on setting the views, refer to View Format on page 3-55.

Press the MEAS SETUP key to set the measurement parameters. The Meas Setup menu varies among the measurement items. Refer to the section shown in Tab le 3-8 .

Table 3-8: Measurement setup reference for the 802.11n (nx1) analysis

Measurement item Reference section

Modulation measurements

Transfer Function Delay Profile EVM versus Time Power versus Time Constellation EVM versus SC Power versus SC SC Constellation Frequency Error OFDM Flatness OFDM Linearity Symbol Table

Power measurements

Spectrum Mask Measurement Setup for Spectrum Mask on page 3-52

* SC: Subcarrier

Measurement Setup for Modulation Measurements on page 3-47

3-46

RSA3408A Option 29 User Manual

Measurement Setup for Modulation Measurements

The Meas Setup menu for the modulation analysis has the following controls:

802.11n (nx1) Analysis

Analyze

Analysis Parameter...

Performs measurements for packets in the analysis range.

NOTE.

When you change settings in the Meas Setup menu described below, press

the Analyze side key to perform the measurement for the modified settings.

You need to set the analysis parameters before pressing the Analyze side key.

Synchronization.

 LT F. Default. Synchronizes with the Long Training Field.

 Pilot. Synchronizes with the pilot signals.

Equalization.

Selects the synchronization method.

Determines whether to apply the data correction using the

long training symbol during the analysis.

 On. Default. Enables the data correction.

 Off. Disables the data correction.

Signal Format.

 1x1. Default. Selects the communication by one Tx and one Rx antenna.

Selects the signal format.

 2x1. Selects the communication by two Tx antennas and one Rx antenna.

Select Tx Antenna...

For Transfogram (Amplitude/Phase) or Delayogram in the subview only. Selects the transmission antenna.

 Tx Antenna 1. Displays the measurement results for signals transmitted by

 Tx Antenna 2. Displays the measurement results for signals transmitted by

Packet #

Selects a packet to analyze. Range: −[(the number of packets in the analysis range) − 1] to 0. Zero (0) represents the latest packet.

RSA3408A Option 29 User Manual

Tx Antenna 1.

Tx Antenna 2.

3-47

802.11n (nx1) Analysis

Select Subcarrier...

Subcarrier #

Symbol #

Selects the subcarrier type for displaying the graph.

 Data + Pilot. Default. Displays the measurement results for data and pilot.

 Data. Displays the measurement results for data only.

 Pilot. Displays the measurement results for pilot only.

 Single Subcarrier. Displays the measurement results for the subcarrier

specified using the Subcarrier # side key below.

Specifies the subcarrier number for the measurement.Range: −64 to +63.

Specifies the analysis symbol number for the measurement. Range: −[(the number of symbols in the analysis range) − 1] to 0. Zero (0) represents the latest analysis symbol.

NOTE.

For definition of the analysis symbol, refer to page 3-50.

The Select Subcarrier..., Subcarrier #, and Symbol # menu items are effective only in the measurements shown in Table 3-9.

Table 3-9: Submenu availability

Measure menu item Select Subcarrier... Subcarrier # Symbol #

Transfer Function Delay Profile EVM versus Time Power versus Time Constellation EVM versus SC Power versus SC SC Constellation Frequency Error OFDM Flatness OFDM Linearity Symbol Table

* SC: Subcarrier

✓ ✓ ✓ ✓ ✓ ✓

✓ ✓

✓

✓ ✓ ✓

✓

3-48

RSA3408A Option 29 User Manual

802.11n (nx1) Analysis

Definition of the Analysis Symbol.

In the modulation analysis, it is important to calculate average values of RMS voltage or center frequency error for enough time to get good analysis results. The length of a signal to calculate the RMS voltage or center frequency error is called “analysis symbol” in the WLAN analysis software. For example, frequency error by the analysis symbol is displayed on the center frequency error view. Although “symbol” is defined for OFDM in the 802.11n standard, “analysis symbol” is used in the WLAN analysis software taking the other modulation types into account.

The following views display the averaged values by analysis symbol for power, EVM, magnitude error, and phase error, respectively.

 Power versus Time

 EVM versus Time

 MagErr versus Time

 PhaseErr versus Time

The following views display analysis results of power, EVM, magnitude error, and phase error, respectively for each data point, chip, or subcarrier contained in one analysis symbol.

 Power versus SC

 EVM versus SC

 MagErr versus SC

 PhaseErr versus SC

The length of an analysis symbol depends on the modulation type as follows:

Table 3-10: Length of an analysis symbol, IEEE802.11n

Part of a signal Type of the signal Length of an analysis symbol

Data part OFDM 80 (20 MHz) / 160 (40 MHz)

sample points DSSS 88 chips CCK 80 chips PBCC 80 data points

Preamble/Header part Short OFDM training field 16 (20 MHz) / 32 (40 MHz)

sample points Long OFDM training field 160 (20 MHz) / 320 (40 MHz)

sample points PLCP preamble 1584 chips Short PLCP preamble 792 chips PLCP header 528 chips Short PLCP header 264 chips

RSA3408A Option 29 User Manual

3-49

802.11n (nx1) Analysis

Modulation Type

Display Filter...

Selects the modulation type(s) to display the measurement results on the screen. The results and graph are shown only for the types set to On. See Figure 3-32.

Select cell to edit.

Selects an item to change the on/off setting in the table on screen. The table consists of five blocks as shown in Figure 3-32. The selected item appears on the second side key where you can turn on or off.

 11bg. Turns on or off the 802.11b and g formats.

All PLCP Packet format On/Off.

Turns on or off all of the following PLCP (Physical

Layer Convergence Protocol) packet formats.

 Legacy. Packets are transmitted in the legacy 802.11a/g format.

 Mixed Mode. Packets are transmitted with a preamble compatible with the

legacy 802.11a/g. The rest of the packet has a new format.

 Green Field. High throughput packets are transmitted without a

legacy compatible part.

All Preambles On/Off.

 Signal (HT-SIG)

Turns on or off all of the following preambles.

Standard

PLCP Packet

format

Preamble

Data

 Short Training Field (HT-STF)

 Long Training Field (HT-LTF)

Select an item and turn it on or off.

GI (Guard Interval)

Operation of PHY (Physical Layer)

Figure 3-32: Modulation Type Display Filter setting in the nx1 analysis

3-50

RSA3408A Option 29 User Manual

802.11n (nx1) Analysis

All Data On/Off.

 OFDM 64QAM

 OFDM 16QAM

 OFDM QPSK

 OFDM BPSK

All GI On/Off.

 Normal (800 ns)

 Short (400 ns)

All Operation of PHY On/Off.

Turns on or off all of the following data.

Turns on or off all of the following GI (Guard Interval).

Turns on or off all of the following operations of PHY

(physical layer).

 20MHz. 20 MHz bandwidth HT (High Throughput) mode.

 40MHz. 40 MHz bandwidth HT (High Throughput) mode.

 Duplicate. Duplicate Legacy Mode in which the device operates in a 40 MHz

channel composed of two adjacent 20 MHz channels.

 Upper. 40 MHz Upper Mode used to transmit a legacy or HT packet in the

upper 20 MHz channel of a 40 MHz channel.

 Lower. 40 MHz Lower Mode used to transmit a legacy or HT packet in the

lower 20 MHz channel of a 40 MHz channel.

RSA3408A Option 29 User Manual

3-51

802.11n (nx1) Analysis

Measurement Setup for Spectrum Mask

The Meas Setup menu for the Spectrum Mask has the following controls:

20 MHz

Span = 100 MHz

−

Spectrum Mask

Power spectral density

−

Selects the transmit spectral mask specified in the IEEE802.11n standard. (See Figure 3-33.)

 20MHz. Default. Selects the mask for 20 MHz transmission.

 40MHz. Selects the mask for 40 MHz transmission.

0 dB

−

20 dB

−

28 dB

−

45 dB

−

Transmit spectrum mask

Typical signal spectrum

302011

Frequency (MHz)

40 MHz

Span = 150 MHz

−

Power spectral density

−

Figure 3-33: 802.11n (nx1) spectrum mask

3-52

0 dB

−

20 dB

−

28 dB

−

45 dB

−

Transmit spectrum mask

Typical signal spectrum

604021

Frequency (MHz)

RSA3408A Option 29 User Manual

802.11n (nx1) Analysis

Limits...

You can edit the spectral mask. Modify the offset frequency and limit level for the points A to D shown in Figure 3-34. The setting values are indicated for each point in the limits table on the bottom of the screen. Use the following controls:

Select column to edit.

Lower Offset Frequency.

Selects the column (A to D) to edit in the limits table.

Sets the frequency offset from the center frequency for the

selected point in the lower side.

Range: −75 MHz to −20 MHz (20 MHz mask) / −40 MHz (40 MHz mask).

Lower Limit.

Sets the limit level for the selected point in the lower side.

Range: −200 to 200 dBr.

Upper Offset Frequency.

Sets the frequency offset from the center frequency for the

selected point in the upper side.

Range: 20 MHz (20 MHz mask) / 40 MHz (40 MHz mask) to 75 MHz.

Upper Limit.

Sets the limit level for the selected point in the upper side.

Range: −200 to 200 dBr.

Lower side Upper side

Figure 3-34: Editing the spectral mask

RSA3408A Option 29 User Manual

3-53

802.11n (nx1) Analysis

Symmetric Mask.

 On. Creates a symmetrical mask. Set the frequency offset and limit values for

Determines whether the mask is symmetrical or not.

the lower side only.

 Off. Allows you to set the frequency offset and limit values for the lower and

the upper side separately.

Default Limits.

Returns the offset and limit settings to the default values.

3-54

RSA3408A Option 29 User Manual

View Format

802.11n (nx1) Analysis

This section provides information about the view formats specific to the 802.11n (nx1) analysis. It consists of two parts:

 View Format for Modulation Measurements

 View Format for Power Measurements

Selecting View Content

You can change the view content with the VIEW: DEFINE key on the front panel. The view contents depend on the measurement items as shown in Table 3-11. In the EVM measurement, you can change the measurement content using the VIEW: SCALE key.

Table 3-11: View content selection, 802.11n (nx1)

→

VIEW: DEFINE

Measurement item Modulation measurement

Transfer Function (Amplitude)

Transfer Function (Phase)

Delay Profile

EVM versus Time

Power versus Time Constellation Vector / Constellation EVM versus SC EVM

Power versus SC SC Constellation Vector / Constellation Frequency Error OFDM Flatness OFDM Linearity Vector / Dot Symbol Table -

Power measurement

Spectrum Mask - - -

* SC: Subcarrier

Overview content

Waveform (default) Spectrogram

VIEW: DEFINE →

Subview content

Spectrum (default) Transogram (Amplitude / Phase) Transfer Function (Amplitude / Phase) Delayogram Delay Profile

Spectrum (default) Constellation EVM versus Time Power versus Time SC Constellation EVM versus SC Power versus SC Frequency Error OFDM Flatness OFDM Linearity Symbol Table

VIEW: SCALE →

Measurement content

EVM

Mag Err Phase Err

NOTE.

(Spectrum Analysis) mode. Refer to the RSA3408A User Manual.

RSA3408A Option 29 User Manual

The View menu for Spectrum Mask is the same as in the S/A

3-55

802.11n (nx1) Analysis

List Display

Available for the modulation measurements other than Transfer Function and Delay Profile. The measurement results are represented in graph form by default.

You can select the list display as shown in Figure 3-35. Press VIEW: DEFINE → Display → List. .

Figure 3-35: List display

3-56

RSA3408A Option 29 User Manual

View Format for Modulation Measurements

The modulation measurement result is displayed in the main view, showing the packet information and measured values on the left side and the measurement graph on the right side (see Figure 3-36).

Packet information

(common to all modulation

measurements)

Measured values

(vary by measurements)

Figure 3-36: Measurement result display (an example of EVM versus Time)

802.11n (nx1) Analysis

Measurement graph

Packet Information

The packet information displayed on the left side of the main view is common to all modulation measurements, containing the following fields:

Format.

 Legacy. Packets are transmitted in the legacy 802.11a/b/g format.

 Mixed Mode. Packets are transmitted with a preamble compatible with the

indicates the signal format.

legacy 802.11a/b/g and the rest of the packet has a new format.

 Green Field. HT packets are transmitted without a legacy compatible part.

Mode.

Indicates the operating mode. There are two major modes:

 Legacy. The legacy mode equivalent to 802.11a/b/g.

 HT. The HT (High Throughput) mode specified in 802.11n.

Each mode is further divided to the following modes by the frequency band used:

 20 MHz. Uses 20 MHz bandwidth.

 40 MHz. Uses 40 MHz bandwidth (HT mode only).

 Duplicate. Uses a 40 MHz channel composed of two adjacent 20 MHz

channel.

 Upper. Uses the upper 20 MHz channel of a 40 MHz channel.

 Lower. Uses the lower 20 MHz channel of a 40 MHz channel.

RSA3408A Option 29 User Manual

3-57

802.11n (nx1) Analysis

Symbol.

 Long or Short Preamble

 L-STF (Legacy Short Training Field)

 L-LTF (Legacy Long Training Field)

 Long or Short Header

 L-SIG (Legacy Signal Field)

 DSSS 1M or 2M

 CCK 5.5M or 11M

 PBCC 5.5M, 11M, 22M, or 33M

 OFDM BPSK, QPSK, 16QAM, or 64QAM

 HT-STF (High Throughput Short Training Field)

 HT-LTF (High Throughput Long Training Field)

 HT-SIG (High Throughput Signal Field)

Indicates the type of preamble, header, or data of the analysis symbol.

If the type cannot be determined, “Unknown” is indicated.

GI.

Indicates the guard interval.

 Normal (800 ns)

 Short (400 ns)

MCS.

Indicates the MCS (Modulation and Coding Scheme) index (0 to 76)

specified in 802.11n. For the details on MCS, refer to the 802.11n specification.

Total Packet / Symbol.

Indicates the total number of packets and analysis symbols

in the analysis range, respectively.

3-58

RSA3408A Option 29 User Manual

802.11n (nx1) Analysis

Transfer Function

(Amplitude)

The main view displays the amplitude transfer function as shown in Figure 3-37. This graph indicates an amplitude variation for each subcarrier during the signal propagation from Tx system to Rx system. The horizontal axis represents subcarrier number and the vertical axis represents amplitude variation in dBm.

Packet information

(refer to page 3-57)

Figure 3-37: Transfer function, amplitude (main view)

View Scale Menu.

following controls:

Aut o Scale. Sets the start value and the scale of the vertical axis automatically to fit the waveform to the screen.

Marker readout

• Horizontal value: Subcarrier number

• Vertical value: Amplitude variation (dBm)

Transmitting and receiving antennas for Trace 1 (yellow) and Trace2 (green) (Displayed when selecting 2x1 in MEAS SETUP

→

Analysis Parameter → Signal Format)

The View Scale menu for Transfer Function (Amplitude) has the

Horizontal Scale. Sets the range of the horizontal axis. Range: 16 to 128 subcarriers.

Horizontal Start. Sets the minimum value (left edge) of the horizontal axis. Range: −64 to 8.

Ver t ic al S c a l e . Sets the range of the vertical axis. Range: 100 µ to 100 dB.

Vertical Start. Sets the minimum value (bottom edge) of the vertical axis. Range: −200 to 0 dBm.

Full Scale. Sets the scale of the vertical axis to the default full-scale value.

RSA3408A Option 29 User Manual

3-59

802.11n (nx1) Analysis

Transfogram (Amplitude)

Marker readout

• Horizontal value: Subcarrier number

• Color value: Amplitude (dBm)

• Vertical value: Time (packet number)

Subview only. It displays the time series of amplitude transfer function. The amplitude at a given subcarrier and time (packet number) is displayed as a color map in a two dimensional diagram as shown in Figure 3-38.

Transmitting and receiving antennas. Transmitting antenna can be selected by MEAS SETUP → Select Tx Antenna...

Figure 3-38: Transogram, amplitude (subview)

View Scale Menu.

The View Scale menu for Transogram (Amplitude) has the

following controls:

Aut o Scale. Sets the start value and the scale of the vertical axis automatically to fit the waveform to the screen.

Horizontal Scale. Sets the scale of the horizontal axis. Range: 16 to 128 subcarriers.

Horizontal Start. Sets the start subcarrier number of the horizontal axis. Range: −64 to 8.

Ver t ic al S i z e. Sets the full scale of the vertical axis. Range: 58 to 59392 packets.

Vertical Start. Sets the start packet number of the vertical axis. Range: − [(the number of packets in the analysis range) − 1] to 0. Zero (0) represents the latest packet.

Color Scale. Sets the range of the color axis. Range: 10 to 100 dB in a 1-2-5 sequence.

The transfogram is displayed in 100 steps (100 colors) from the minimum value (blue) to the maximum value (red) in the default state.

Color Stop. Sets the maximum value (top edge) of the color axis. Range: −100 to 100 [dB].

Full Scale. Sets Color Stop to 0 (zero) and Color Scale to 100 dBm.

3-60

RSA3408A Option 29 User Manual

802.11n (nx1) Analysis

Transfer Function

(Phase)

The main view displays the phase transfer function as shown in Figure 3-39. This graph indicates a phase lead or lag for each subcarrier during the signal propagation from Tx system to Rx system. The horizontal axis represents subcarrier number and the vertical axis represents phase lead or lag in degrees or radians.

Packet information

(refer to page 3-57)

Figure 3-39: Transfer function, phase (main view)

View Scale Menu.

following controls:

Aut o Scale. Sets the start value and the scale of the vertical axis automatically to fit the waveform to the screen.

Marker readout

• Horizontal value: Subcarrier number

• Vertical value: Phase lead/lag (degrees)

Transmitting and receiving antennas for Trace 1 (yellow) and Trace2 (green) (Displayed when selecting 2x1 in MEAS SETUP

→

Analysis Parameter → Signal Format)

The View Scale menu for Transfer Function (Amplitude) has the

Horizontal Scale. Sets the range of the horizontal axis. Range: 16 to 128 subcarriers.

Horizontal Start. Sets the minimum value (left edge) of the horizontal axis. Range: −64 to 8.

Ver t ic al S c a l e . Sets the range of the vertical axis. Range: 800 µ to 800 degrees.

Ver t ic al S t a r. Sets the minimum value (bottom edge) of the vertical axis. Range: −1200 to 400 degrees.

Full Scale. Sets the scale of the vertical axis to the default full-scale value.

RSA3408A Option 29 User Manual

3-61

802.11n (nx1) Analysis

Transfogram (Phase)

Marker readout

• Horizontal value: Subcarrier number

• Color value: Phase (degrees)

• Vertical value: Time (packet number)

Subview only. It displays the time series of phase transfer function. The phase at a given subcarrier and time (packet number) is displayed as a color map in a two dimensional diagram as shown in Figure 3-40.

Transmitting and receiving antennas. Transmitting antenna can be selected by MEAS SETUP → Select Tx Antenna...

Figure 3-40: Transfogram, phase (subview)

View Scale Menu.

The View Scale menu for Transogram (Phase) has the following

controls:

Aut o Scale. Sets the start value and the scale of the vertical axis automatically to fit the waveform to the screen.

Horizontal Scale. Sets the scale of the horizontal axis. Range: 16 to 128 subcarriers.

Horizontal Start. Sets the start channel number of the horizontal axis. Range: −64 to 8.

Ver t ic al S i z e. Sets the full scale of the vertical axis. Range: 58 to 59392 packets.

Vertical Start. Sets the start packet number of the vertical axis. Range: − [(the number of packets in the analysis range) − 1] to 0. Zero (0) represents the latest packet.

Color Scale. Sets the range of the color axis: Range: 10 to 100 dB in 1-2-5 sequence.

The transogram is displayed in 100 steps (100 colors) from the minimum value (blue) to the maximum value (red) in the default state.

Color Stop. Sets the maximum value (top edge) of the color axis. Range: −100 to +100 dB.

Full Scale. Sets Color Stop to 0 (zero) and Color Scale to 100 dBm.

3-62

RSA3408A Option 29 User Manual

802.11n (nx1) Analysis

Delay Profile

The main view shows the delay profile as shown in Figure 3-41. In the n× 1 communication method, transmitted signals propagate through multipath with different distance to reach a receiving antenna. The path difference causes the received signals some temporal dispersion. The delay profile shows the power distribution to the delay time. The vertical axis represents amplitude in dBm and the horizontal axis represents delay time in seconds.

Packet information

(refer to page 3-57)

Figure 3-41: Delay profile (main view)

View Scale Menu.

controls:

Marker readout

• Horizontal value: Delay time (s)

• Vertical value: Amplitude (dBm)

Transmitting and receiving antennas for Trace 1 (yellow) and Trace2 (green) (Displayed when selecting 2x1 in MEAS SETUP

→

Analysis Parameter → Signal Format)

The View Scale menu for Delay Profile has the following

Aut o Scale. Sets the start value and the scale of the vertical axis automatically to fit the waveform to the screen.

Horizontal Scale. Sets the range of the horizontal axis. Range: S

/16 to S0 (sec) where S0 is the initial horizontal scale.

Horizontal Start. Sets the minimum value (left edge) of the horizontal axis. Range: −S

/2 to [S0/2 − (Horizontal Scale)] (sec).

Ver t ic al S c a l e . Sets the range of the vertical axis. Range: 100 µ to 100 dB.

Ver t ic al S t a r. Sets the minimum value (bottom edge) of the vertical axis. Range: −200 to 0 dBm.

Full Scale. Sets the scale of the vertical axis to the default full-scale value.

RSA3408A Option 29 User Manual

3-63

802.11n (nx1) Analysis

Delayogram

Subview only. It displays the time series of delay profile. The power at a given delay time and packet number is displayed as a color map in a two dimensional diagram as shown in Figure 3-42.

Marker readout

• Horizontal value: Delay time (s)

• Color value: Amplitude (dBm)

• Vertical value: Time, packet number

Figure 3-42: Delayogram (subview)

View Scale Menu.

controls:

Aut o Scale. Sets the start value and the scale of the vertical axis automatically to fit the waveform to the screen.

Transmitting and receiving antennas. Transmitting antenna can be selected by MEAS SETUP → Select Tx Antenna...

The View Scale menu for Delayogram has the following

Horizontal Scale. Sets the range of the horizontal axis. Range: S

/16 to S0 (sec) where S0 is the initial horizontal scale.

Horizontal Start. Sets the minimum value (left edge) of the horizontal axis. Range: −S

/2 to [S0/2 − (Horizontal Scale)] (sec).

Ver t ic al S i z e. Sets the full scale of the vertical axis in frames. Range: 58 to 59392.

Vertical Start. Sets the start packet number of the vertical axis. Range: − [(the number of packets in the analysis range) − 1] to 0. Zero (0) represents the latest packet.

Color Scale. Sets the range of the color axis: Range: 10 to 100 dB in 1-2-5 sequence.

The delayogram is displayed in 100 steps (100 colors) from the minimum value (blue) to the maximum value (red) in the default state.

Color Stop. Sets the maximum value (top edge) of the color axis. Range: −100 to +100 dB.

Full Scale. Sets Color Stop to 0 (zero) and Color Scale to 100 dBm.

3-64

RSA3408A Option 29 User Manual

802.11n (nx1) Analysis

EVM versus Time

Packet information

(refer to page 3-57)

Measurement readout

(refer to the table below)

The main view shows the EVM of carriers, or one or all subcarriers in a line graph, as shown in Figure 3-43. The vertical axis represents EVM in percent and the horizontal axis represents time in seconds.

Marker readout

• Horizontal value: Time (s)

• Vertical value: EVM (%) Modulation type

The Select Subcarrier setting in the Meas Setup menu

Subcarrier number setting in the Meas Setup menu (displayed when Select Subcarrier is set to Single Subcarrier)

Preamble indicator: “Preamble On” is displayed when one or more preambles are enabled in Modulation Type Display Filter of the Meas Setup menu.

Figure 3-43: EVM versus Time (main view)

The following table shows the measurement readout that is displayed on the left in the main view:

Measurement readout Unit Description

EVM (rms) %, dB RMS value of EVM

(Peak @ time) %, dB Peak value of EVM at the time

Mag Error (rms) %, dB RMS value of Mag Error

(Peak @ time) %, dB Peak value of Mag Error at the time

Phase Error (rms) degrees or radians RMS value of Phase Error

(Peak @ time) degrees or radians Peak value of Phase Error at the time

Origin Offset dB Origin offset (IQ feedthrough)

The time is relative to the last data point.

RSA3408A Option 29 User Manual

3-65

802.11n (nx1) Analysis

View Scale Menu.

The View Scale menu for EVM versus Time has the following

controls:

Aut o Scale. Sets the start value and the scale of the vertical axis automatically to fit the waveform to the screen.

Horizontal Scale. Sets the range of the horizontal axis (time).

Horizontal Start. Sets the minimum value (left edge) of the horizontal axis.

NOTE.

The horizontal display range must be within the analysis range specified

using the Timing menu (refer to page 2-6).

Ver t ic al S c a l e . Sets the range of the vertical axis. Refer to Table 3-12 for the setting range.

Vertical Start. When the measurement content is EVM, sets the minimum value (bottom edge) of the vertical axis. Refer to Table 3-12 for the setting range.

Vertical Offset. When the measurement content is Mag Error or Phase Error, sets the center value ((maximum + minimum) / 2) of the vertical axis. Refer to Table 3-12 for the setting range.

Table 3-12: Vertical setting range

Measurement Vertical Scale Vertical Start Vertical Offset

EVM 100 Magnitude error 200 Phase error 450

to 100%

to 200% -

to 450

−

100 to 100% -

−

200 to 200%

−

450 to 450

Full Scale. Sets the scale of vertical axis to the default full-scale value.

Measurement Content... Selects how to display the vertical axis:

 EVM. Represents the vertical axis with EVM (Error Vector Magnitude).

 Mag Error. Represents the vertical axis with magnitude error.

 Phase Error. Represents the vertical axis with phase error.

3-66

RSA3408A Option 29 User Manual

802.11n (nx1) Analysis

MagErr versus Time

Packet information

(refer to page 3-57)

Measurement readout

(refer to page 3-65)

The main view shows the magnitude error of carriers, or one or all subcarriers in a line graph, as shown in Figure 3-44. The vertical axis represents magnitude error in percent and the horizontal axis represents time in seconds.

Marker readout

• Horizontal value: Time (s)

• Vertical value: Magnitude error (%)

Modulation type

The Select Subcarrier setting in the Meas Setup menu

Subcarrier number setting in the Meas Setup menu (displayed when Select Subcarrier is set to Single Subcarrier)

Preamble indicator: “Preamble On” is displayed when one or more preambles are enabled in Modulation Type Display Filter of the Meas Setup menu.

Figure 3-44: MagErr versus Time (main view)

The measurement readout is the same as in EVM versus Time, shown in the table on page 3-65.

View Scale Menu.

Refer to the View Scale menu of EVM versus Time on page 3-66.

RSA3408A Option 29 User Manual

3-67

802.11n (nx1) Analysis

PhaseErr versus Time

Packet information

(refer to page 3-57)

Measurement readout

(refer to page 3-65)

The main view shows the phase error of carriers, or one or all subcarriers in a line graph, as shown in Figure 3-45. The vertical axis represents phase error in degrees or radians and the horizontal axis represents time in seconds.

Marker readout

• Horizontal value: Time (s)

• Vertical value: Phase error (degrees or radians) Modulation type

The Select Subcarrier setting in the Meas Setup menu

Subcarrier number setting in the Meas Setup menu (displayed when Select Subcarrier is set to Single Subcarrier)

Preamble indicator: “Preamble On” is displayed when one or more preambles are enabled in Modulation Type Display Filter of the Meas Setup menu.

Figure 3-45: PhaseErr versus Time (main view)

The measurement readout is the same as in EVM versus Time, shown in the table on page 3-65.

View Scale Menu.

Refer to the View Scale menu of EVM versus Time on page 3-66.

3-68

RSA3408A Option 29 User Manual

Tektronix RSA3408A User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Warranty 2

Table of Contents

Preface

About This Manual

Related Manuals

Getting Started

Measurement Items

Accessing the Measurements

Operating Basics

Screen Elements

Setting Frequency and Span

Setting Timing Parameters

View Operation

Saving Measurement Results

IEEE802.11a/b/g Analysis

Basic Measurement Procedure

Meas Setup Menu

Measurement Setup for Modulation Measurements

Measurement Setup for Spectrum Mask

Measurement Setup for Transmit Power

View Format

View Format for Modulation Measurements

View Format for Power Measurement

802.11n (nx1) Analysis

Data Process Flow for MISO (2x1)

Basic Measurement Procedure

Meas Setup Menu

Measurement Setup for Modulation Measurements

Measurement Setup for Spectrum Mask

View Format

View Format for Modulation Measurements