User Manual
WCA230A & WCA280A Option 24
GSM/EDGE Analysis Software
071-1479-00
This document applies to firmware version 2.0
and above.
www.tektronix.com
Copyright © Tektronix Japan, Ltd. All rights reserved.
Copyright © Tektronix, Inc. All rights reserved.
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 Japan, Ltd., Shinagawa Intercity Building B 6th Floor, 2-15-2 Konan, Minato-ku, Tokyo 108-6106 Japan
Tektronix, Inc., P.O. Box 500, Beaverton, OR 97077
TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.
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Hardware Warranty
Tektronix warrants that the products that it manufactures and sells will be free from defects in materials and workmanship
for a period of one (1) year from the date of shipment. If a 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.
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 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.
Software Warranty
Tektronix warrants that the media on which this software product is furnished and the encoding of the programs on the
media will be free from defects in materials and workmanship for a period of three (3) months from the date of shipment.
If a medium or encoding proves defective during the warranty period, Tektronix will provide a replacement in exchange
for the defective medium. Except as to the media on which this software product is furnished, this software product is
provided “as is” without warranty of any kind, either express or implied. Tektronix does not warrant that the functions
contained in this software product will meet Customer’s requirements or that the operation of the programs will be
uninterrupted or error–free.
In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration of the
warranty period. If Tektronix is unable to provide a replacement that is free from defects in materials and workmanship
within a reasonable time thereafter, Customer may terminate the license for this software product and return this software
product and any associated materials for credit or refund.
THIS WARRANTY IS GIVEN BY TEKTRONIX 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
REPLACE DEFECTIVE MEDIA OR REFUND CUSTOMER’S PAYMENT 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.
Table of Contents
Getting Started
Operating Basics
Preface v. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Definition of the GSM/EDGE Analysis 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Channel Frequencies 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Measurement Functions 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Measurement Menu 1–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Burst Analysis 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Measurement Procedure 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Meas Setup Menu 2–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Modulation Accuracy Measurement 2–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mean Carrier Power Measurement 2–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power versus Time Measurement 2–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Modulation Spectrum Measurement 2–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Switching Spectrum Measurement 2–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Spurious Analysis 2–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Measurement Procudure 2–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Meas Setup Menu 2–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Measurement Example 2–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Scale and Format of View 2–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Constellation View 2–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
EVM View 2–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power vs. Time View 2–20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Syntax and Commands
Command Groups 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Functional Groups 3–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
:CONFigure Commands 3–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
:DISPlay Commands 3–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
:FETCh Commands 3–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
:READ Commands 3–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
:SENSe Commands 3–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
:CONFigure Commands 3–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
:DISPlay Commands 3–17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
:FETCh Commands 3–45. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
:READ Commands 3–57. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
:SENSe Commands 3–69. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
WCA230A & WCA280A Option 24 User Manual
i
Table of Contents
Appendices
Index
Appendix A: Specifications A–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Characteristics A–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix B: Factory Initialization Settings B–1. . . . . . . . . . . . . . . . . . . . .
Appendix C: Scale Setting Range C–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix D: SCPI Conformance Information D–1. . . . . . . . . . . . . . . . . . .
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WCA230A & WCA280A Option 24 User Manual
List of Figures
Table of Contents
Figure 1–1: An example of the GSM/EDGE analysis display 1–1. . . . . . .
Figure 1–2: Slot data structure 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–3: GSM/EDGE standard masks for Power versus Time
measurement 1–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–4: GSM/EDGE measurement menu 1–8. . . . . . . . . . . . . . . . . . .
Figure 2–1: Setting analysis range on the overview 2–2. . . . . . . . . . . . . . .
Figure 2–2: Modulation accuracy measurement 2–6. . . . . . . . . . . . . . . . .
Figure 2–3: Mean carrier power measurement 2–7. . . . . . . . . . . . . . . . . .
Figure 2–4: Power versus Time measurement 2–8. . . . . . . . . . . . . . . . . . .
Figure 2–5: Modulation spectrum measurement 2–9. . . . . . . . . . . . . . . . .
Figure 2–6: Switching spectrum measurement 2–10. . . . . . . . . . . . . . . . . .
Figure 2–7: Spurious measurement 2–13. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–8: Vector and Constellation display 2–16. . . . . . . . . . . . . . . . . . . .
Figure 2–9: EVM, amplitude error, and phase error display 2–18. . . . . . .
Figure 2–10: Expanding a burst 2–20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
WCA230A & WCA280A Option 24 User Manual
iii
Table of Contents
List of Tables
Table 1–1: Additional functions in Option 24 1–1. . . . . . . . . . . . . . . . . . .
Table 1–2: Channel Frequencies 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–3: Measurement items 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–4: Modulation spectrum standard masks 1 1–5. . . . . . . . . . . . .
Table 1–5: Switching spectrum standard masks 1 1–6. . . . . . . . . . . . . . .
Table 1–6: Spurious measurement conditions 1–7. . . . . . . . . . . . . . . . . . .
Table 3–1: Measurement mode added in Option 24 3–1. . . . . . . . . . . . . .
Table 3–2: List of command groups 3–2. . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 3–3: :CONFigure commands 3–3. . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 3–4: :DISPlay commands 3–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 3–5: :FETCh commands 3–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 3–6: :READ commands 3–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 3–7: :SENSe commands 3–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 3–8: :DISPlay command subgroups 3–17. . . . . . . . . . . . . . . . . . . . . .
Table 3–9: Main view display formats 3–20. . . . . . . . . . . . . . . . . . . . . . . . .
Table 3–10: Subview display formats 3–27. . . . . . . . . . . . . . . . . . . . . . . . . .
Table 3–11: X offset setting range 3–35. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 3–12: :SENSe command subgroups 3–69. . . . . . . . . . . . . . . . . . . . . .
Table 3–13: GSM/EDGE measurement items 3–79. . . . . . . . . . . . . . . . . . .
Table A–1: GSM/EDGE (Option 24) A–1. . . . . . . . . . . . . . . . . . . . . . . . . .
Table B–1: Factory initialization settiings — :DISPlay commands B–1. .
Table B–2: Factory initialization settiings — :SENSe commands B–2. . .
Table C–1: Display format and scale C–1. . . . . . . . . . . . . . . . . . . . . . . . . .
Table D–1: SCPI conformance information — :CONFigure
commands D–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table D–2: SCPI conformance information — :DISPlay commands D–1
Table D–3: SCPI conformance information — :FETCh commands D–2.
Table D–4: SCPI conformance information — :READ commands D–3.
Table D–5: SCPI conformance information — :SENSe commands D–4.
iv
WCA230A & WCA280A Option 24 User Manual
Preface
About This Manual
This manual describes how to use the WCA230A and WCA280A Option 24
GSM/EDGE Analysis Software. For details on the standard functions of the
analyzer, refer to the WCA230A and WCA280A Wireless Communication
Analyzers User Manual.
The manual consists of the following sections:
H Getting Started describes the overview of the GSM/EDGE analysis.
H Operating Basics explains the menu functions and measurement procedures.
H Syntax and Commands presents descriptions of the GPIB commands
provided in Option 24.
H Appendices provide additional information including factory initialization
settings, scale setting ranges, and SCPI conformance informatin.
Related Documents
The following documents are also available for the analyzer.
H WCA230A and WCA280A User Manual
(Standard accessory; Tektronix part number 071-1253-XX)
Describes how to install the analyzer and how to work with the menus, and
details the standard functions. Also shows the specifications.
H WCA230A and WCA280A Programmer Manual
(Standard accessory; Tektronix part number 071-1255-XX)
Contains an alphabetical listing of the programming commands and other
information related to controlling the analyzer over the GPIB interface.
WCA230A & WCA280A Option 24 User Manual
v
Preface
Conventions
This manual uses the following conventions:
H Front-panel button and control labels are printed in the manual in upper case
text. For example, SPAN, PEAK, PRINT. If it is part of a procedure, the
button or control label is printed in boldface. For example:
Press SPAN.
H To easily find buttons on the front panel, the area name label is printed together
with the button by concatenating with a colon (:), as in MODE: DEMOD,
VIEW: SCALE, MARKERS: SELECT, etc. For example:
Press the MODE: DEMOD key.
H Menu and on-screen form titles are printed in the manual in the same case
(initial capitals) as they appear on the analyzer screen, such as Span, Source,
and Channel Power. If it is part of a procedure, the menu title is shown in
boldface. For example:
Press the Source side key.
H A list of keys, controls, and/or menu items separated by an arrow symbol
(Õ) indicates the order in which to perform the listed tasks. For example:
Select RBW/FFT Õ Filter Shape...Õ Gaussian.
vi
WCA230A & WCA280A Option 24 User Manual
Contacting Tektronix
Preface
Phone 1-800-833-9200*
Address Tektronix, Inc.
Department or name (if known)
14200 SW Karl Braun Drive
P.O. Box 500
Beaverton, OR 97077
USA
Web site www.tektronix.com
Sales support 1-800-833-9200, select option 1*
Service support 1-800-833-9200, select option 2*
Technical support Email: techsupport@tektronix.com
1-800-833-9200, select option 3*
6:00 a.m. – 5:00 p.m. Pacific time
* This phone number is toll free in North America. After office hours, please leave a
voice mail message.
Outside North America, contact a Tektronix sales office or distributor; see the
Tektronix web site for a list of offices.
WCA230A & WCA280A Option 24 User Manual
vii
Preface
viii
WCA230A & WCA280A Option 24 User Manual
Getting Started
Getting Started
This section outlines the modulation analysis according to the GSM/EDGE
standard using WCA230A and WCA280A Option 24. Table 1–1 summarizes the
additional functions in Option 24 by measurement mode.
Table 1-1: Additional functions in Option 24
Measurement mode Additional functions
S/A (spectrum analysis) None
Demod (modulation analysis) Six measurement functions under the GSM/EDGE standard
Time (time analysis) None
Figure 1–1 shows an example of the GSM/EDGE analysis.
Figure 1-1: An example of the GSM/EDGE analysis display
WCA230A & WCA280A Option 24 User Manual
1-1
Getting Started
Definition of the GSM/EDGE Analysis
The analyzer performs GSM/EDGE analysis that conforms to the
3GPP TS45.005 V4.1.0.5 standard.
Channel Frequencies
The analyzer includes GSM/EDGE channel tables as shown in Table 1–2:
Table 1-2: Channel Frequencies
Channel
Standard Link
GSM850 Uplink 128 to 251 824.2 to 848.8 0.2 (N - 128) + 824.2
Downlink 128 to 251 869.2 to 893.8 0.2 (N - 128) + 869.2
GSM900 Uplink 0 to 124 890 to 914.8 0.2N + 890
Downlink 0 to 124 935 to 959.8 0.2N + 935
DCS1800 Uplink 512 to 885 1710.2 to 1784.8 0.2 (N - 512) + 1710.2
Downlink 512 to 885 1805.2 to 1879.8 0.2 (N -512) + 1805.2
PCS1900 Uplink 512 to 810 1850.2 to 1908.8 0.2 (N - 512) + 1850.2
Downlink 512 to 810 1930.2 to 1989.8 0.2 (N - 512) + 1930.2
(N)
975 to 1023 880.2 to 889.8 0.2 (N - 1024) + 890
975 to 1023 925.2 to 934.8 0.2 (N - 1024) + 935
Frequency range
(MHz)
Frequency calculation
formula (MHz)
1-2
WCA230A & WCA280A Option 24 User Manual
Measurement Functions
Getting Started
The analyzer provides six GSM/EDGE measurement functions as shown in
Table 1–3:
Table 1-3: Measurement items
Measurement item Standard
Modulation accuracy GSM 11.20 - 2.1.6.2
Mean carrier power GSM 11.20 - 2.1.6.3
Power versus Time GSM 11.20 - 2.1.6.4
Modulation spectrum GSM 11.20 - 2.1.6.5.1
Switching spectrum GSM 11.20 - 2.1.6.5.2
Spurious signals within transmisĆ
sion band
GSM 5.05 v.8.5.0/4.3.3
Modulation Accuracy
Mean Carrier Power
The analyzer measures EVM (Error Vector Magnitude), amplitude error, and
phase error in accordance with the GSM standard 11.20 – 2.1.6.2.
The analyzer uses the 147 symbols located at the center of a specified burst to
measure EVM, amplitude error, phase error, waveform quality (r), frequency
error, and origin offset. (“Origin offset” is also called “IQ feedthrough”.)
The analyzer measures mean carrier power in accordance with the GSM standard
11.20 – 2.1.6.3.
Figure 1–2 illustrates the data structure of a slot. The analyzer measures power in
the interval E (Data 2) located after TS (Training Sequence) for each burst to
calculate the mean value of the power within the measurement range.
T (#H0) G (#HFF)
T (#H0)
E
(Data 1)
58
3
TS
(#H0970897)
26
E
(Data 2)
58
3 bit
8.25
Figure 1-2: Slot data structure
WCA230A & WCA280A Option 24 User Manual
1-3
Getting Started
Power versus Time
[dB]
+4
+1
0
-1
-6
-30
*1
10 8 10 542.8 10 8 10 [ms]
The analyzer measures Power versus Time in accordance with the GSM standard
11.20 – 2.1.6.4.
The analyzer demodulates a specified burst and synchronizes with the TS
(Training Sequence). The analyzer uses the comparison between the spectrum
and the GSM/EDGE standard mask (see Figure 1–3), to determine the Pass/Fail
status of the test.
GMSK (GSM850/900, DCS1800)
[dB]
+4
+1
0
-1
-6
-30
*1
10 8 10 542.8 10 8 10 [ms]
GMSK (PCS1900)
[dB]
+4
+2.4
+1
-1
-6
-15
-30
0
*1
10 8 10 542.8 10 8 10 [ms]
2222
EDGE
*1. -59 dBc or -54 dBm (whichever is higher)
for GSM850/900 uplink bands
-48 dBc or -48 dBm (whichever is higher)
for DCS1800 and PCS1900 uplink bands
-30 dBc for all downlink bands
Figure 1-3: GSM/EDGE standard masks for Power versus Time measurement
1-4
WCA230A & WCA280A Option 24 User Manual
Getting Started
Modulation Spectrum
The analyzer measures the spectrum generated by the modulation process in
accordance with the GSM standard 11.20 – 2.1.6.5.1.
The analyzer acquires the input signal with a span of 15 MHz and demodulates a
single burst. The spectrum of the burst is calculated from the center of the
training sequence over an interval of 320 ms. This spectrum is calculated using a
30 kHz RBW up to 1.8 MHz from the carrier, and 100 kHz RBW from 1.8 to 6
MHz from the carrier. Finally, the analyzer compares the spectrum and
GSM/EDGE standard masks (see Table 1–4 below) to determine pass/fail status
of testing.
-54
-54
1
≥1.8<3≥3
<1.8
-60 -63 -65 -71
≥1.8<3≥3
<1.8
-70 -73 -75 -80
<6
<6
≥6
≥6
Table 1-4: Modulation spectrum standard masks
GSM850/900 uplink
Offset (MHz) 0.1 0.2 0.25 0.4 ≥0.6
Level (dBc) +0.5 -30 -33 -60
GSM850/900 downlink
Offset (MHz) 0.1 0.2 0.25 0.4 ≥0.6
Level (dBc) +0.5 -30 -33 -60
DCS1800 uplink
Offset (MHz) 0.1 0.2 0.25 0.4 ≥0.6
<1.8
Level (dBc) +0.5 -30 -33 -60
-54
DCS1800 downlink
Offset (MHz) 0.1 0.2 0.25 0.4 ≥0.6
Level (dBc) +0.5 -30 -33 -60
-56
1
The levels are common for GMSK and EDGE. In cases where two values are
indicated in a single column, however, values in the upper line are for GMSK and
values in the lower line are for EDGE.
-60 -59 -67
<1.2
-70 -73 -75 -80
≥1.8<6≥6
≥1.2
<1.8
≥1.8<6≥6
WCA230A & WCA280A Option 24 User Manual
1-5
Getting Started
Switching Spectrum
-54
-56
1
(Cont.)
≥1.2
<1.2
-60 -60 -59 -67
<1.2
-70 -73 -75 -80
<1.8
≥1.2
<1.8
≥1.8<6≥6
≥1.8<6≥6
Table 1-4: Modulation spectrum standard masks
PCS1900 uplink
Offset (MHz) 0.1 0.2 0.25 0.4 ≥0.6
Level (dBc) +0.5 -30 -33 -60
PCS1900 downlink
Offset (MHz) 0.1 0.2 0.25 0.4 ≥0.6
Level (dBc) +0.5 -30 -33 -60
The analyzer measures the spectrum due to switching transients in accordance
with the GSM standard 11.20 – 2.1.6.5.2.
The analyzer acquires the input signal with a span of 5 MHz, and calculates the
spectrum using a 30 kHz RBW conversion. The analyzer uses peak hold for
multiple bursts, and compares the spectrum with GSM/EDGE masks (see
Table 1–5) to determine pass/fail status of the test.
Table 1-5: Switching spectrum standard masks
GSM850/900, DCS1800, and PCS1900 uplink
Offset (MHz) 0.4 0.6 1.2 1.8
Level (dBc) -23 -26 -32 -36
GSM850/900 downlink
Offset (MHz) 0.4 0.6 1.2 1.8
Level (dBc) -57 / -52 -67 / -62 -74 -74
DCS1800 and PCS1900 downlink
Offset (MHz) 0.4 0.6 1.2 1.8
Level (dBc) -50 -58 -66 -66
1
The levels are common for GMSK and EDGE. In cases where two values are
indicated in a single column, however, the values to the left are for GMSK and the
values to the right are for EDGE.
1
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WCA230A & WCA280A Option 24 User Manual
Getting Started
( )
36 dBm
Inband Spurious Signals
The analyzer detects the spurious signals existing within the transmission band
in accordance with the GSM standard 5.05 version 8.5.0/4.3.3.
The analyzer calculates the spectrum of the input signal, using the correct RBW
for the frequency offset from the carrier, as shown in Table 1–6. The largest peak
in the specified transmission band is assumed to be the carrier and all other peaks
are assumed to be spurious responses.
Table 1-6: Spurious measurement conditions
Standard Transmission band RBW Threshold
GSM850 824 to 849 MHz (Uplink)
869 to 894 MHz (Downlink)
GSM900 876 to 915 MHz (Uplink)
921 to 960 MHz (Downlink)
DCS1800 1710 to 1785 MHz (Uplink)
1805 to 1880 MHz (Downlink)
PCS1900 1850 to 1910 MHz (Uplink)
1930 to 1960 MHz (Downlink)
1
UserĆdefinable
30 kHz (Offset ≥1.8 MHz)
100 kHz (Offset ≥6 MHz)
-
1
WCA230A & WCA280A Option 24 User Manual
1-7
Getting Started
Measurement Menu
Figure 1–4 shows the measurement menu items added in Option 24.
Standard... GSM/EDGE Modulation Accuracy
Mean Carrier Power
Power versus Time
Modulation Spectrum
Switching Spectrum
Inband Spurious
Figure 1-4: GSM/EDGE measurement menu
The following sections provide the measurement procedures.
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WCA230A & WCA280A Option 24 User Manual
Operating Basics
Burst Analysis
The following five measurements can be performed on one or more GSM/EDGE
bursts:
H Modulation accuracy
H Mean carrier power
H Power versus time
H Modulation spectrum
H Switching spectrum
The burst analysis is based on the digital modulation analysis function. For the
digital modulation analysis, refer to the WCA230A and WCA280A User Manual.
For the spurious signal analysis, refer to page 2–11.
Measurement Procedure
Use the following steps to perform the burst analysis:
1. Select the measurement:
a. Press the DEMOD key on the front panel.
b. Press the Standard... side key and then the GSM/EDGE side key.
c. Press one of the following side keys to select the measurement:
Modulation Accuracy
Mean Carrier Power
Power vs. Time
Modulation Spectrum
Switching Spectrum
2. Acquire the waveform of signal to be measured:
NOTE. When the input signal is not according to the GSM/EDGE standard, no
measurement result may be displayed. However, the waveform of the signal will
still be displayed in the overview.
a. Press the FREQUENCY/CHANNEL key on the front panel to set
center frequency.
WCA230A & WCA280A Option 24 User Manual
2-1
Burst Analysis
How to use the channel table:
H Press Channel Table... side key.
H Select one of the GSM/EDGE standards.
H Use Channel side key to select a channel.
b. Press the SPAN key on the front panel to set span. Range: 1 to 15 MHz
NOTE. It is important to set the span as narrow as possible for the selected
modulation type, and to adjust the reference level carefully. Setting these
parameters incorrectly can result in incorrect recognition of the signal’s
modulation type.
c. Press the AMPLITUDE key on the front panel to set up the amplitude
of the signal near the full scale in the overview.
d. Press the TRIG key on the front panel to set up the trigger as necessary.
e. Press the TIMING key on the front panel, and then press the Acquisi-
tion Length side key to set the number of slots for one acquisition block
(see Figure 2–1). Default: 17 slots.
f. After you have acquired the measurement data, you can stop the
acquisition using the RUN/STOP key.
Acquisition History
(Block number)
Overview
The burst specified with the Burst Select
side key selects the burst to be analyzed.
The area between two vertical green lines
indicates the analysis range. The result of
analysis is displayed in the main view.
The area between two vertical pink lines
indicates the range of the FFT process, that
is one FFT frame, to display the spectrum in
the subview.
Acquisition Length
(Time length to acquire one block)
Figure 2-1: Setting analysis range on the overview
2-2
WCA230A & WCA280A Option 24 User Manual
Burst Analysis
3. From the overview, select the burst to be analyzed (see Figure 2–1).
a. Press the TIMING key on the front panel.
b. If you acquired the signal in continuous trigger repeat:
Press the Acquisition History side key to specify the block number to
be analyzed. Block number “0” corresponds to the latest block.
c. Press the Burst Select side key to specify the burst number to be
analyzed. Burst number “0” corresponds to the latest burst.
How to return to the first burst:
To select the first burst of all the data that has been acquired in memory,
press the Return to First Burst side key.
NOTE. In GSM/EDGE, the analysis length must be at least 1.28 ms.
The specified burst is analyzed and the result of the analysis is displayed on
the screen.
4. Press the MEAS SETUP key and change the measurement conditions as
necessary.
For the Meas Setup menu, refer to page 2–4.
5. In repeating the analysis of waveform data that has been acquired in
memory, do the following steps:
a. Press the TIMING key on the front panel.
b. If you acquired the signal in continuous trigger repeat:
Press the Acquisition History side key to specify the block number to
be analyzed.
c. Press the Burst Select side key to specify the burst number to be
analyzed.
How to return to the first burst:
To select the first burst of all the data that has been acquired in memory,
press the Return to First Burst side key.
d. Press the MEAS SETUP key on the front panel and then press the
Analyze from Selected Burst side key.
The analyzer performs analysis from the burst specified in step c to the end
of the waveform data. To interrupt the analysis, press the Cancel-Back (top)
side key.
WCA230A & WCA280A Option 24 User Manual
2-3
Burst Analysis
Meas Setup Menu
The Meas Setup menu items for the burst analysis are as follows:
Modulation Type. Selects the modulation type.
H GMSK. Default. Selects GMSK (Gaussian filtered Minimum Shift Keying).
H EDGE. Selects EDGE (Enhanced Data rate for GSM Evolution).
Standard... Selects specification of the mask for comparison with the spectrum
waveform:
H GSM850-UL
H GSM850-DL
H GSM900-UL
H GSM900-DL
H DCS1800-UL
H DCS1800-DL
H PCS1900-UL
H PCS1900-DL
UL and DL mean uplink and downlink, respectively.
This menu item is unavailable in the mean carrier power measurement.
Burst Select. Sets the burst number to be analyzed. This menu item is the same as
the Burst Index parameter in the Timing menu. Burst number “0” corresponds to
the latest burst. The larger the negative values, the older the bursts.
Return to First Burst. Selects the first burst of all the data that has been acquired
in memory. This menu item is invalid during acquisition of an input signal.
Analyze from Selected Burst. Press this key for repeated analysis of waveform
data that has previously been acquired in memory. The analysis is done from the
selected burst. This menu item is invalid during acquisition of an input signal.
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WCA230A & WCA280A Option 24 User Manual
Burst Analysis
TS Code Filtering. Determines whether to perform the analysis while specifying
Training Sequence (TS) or not.
H Off. Default. No training sequence is specified. The analyzer will perform
the analysis for all the training sequences.
H 0 to 7. Sets the training sequence code number to be analyzed. The analysis
result is displayed in the main view only for the bursts containing the
specified training sequence, and only results from bursts containing the
specified training sequence are included in averaged results.
This menu item is unavailable in the switching spectrum measurement.
Analyze Includes. Sets the number of symbols for EVM calculation in the
modulation accuracy measurement.
H 142. Measures 142 symbols excluding the tail bits for the EDGE signal.
H 147. Measures 147 symbols specified for the GMSK signal.
H 148. Measures all symbols in a burst.
Midpoint shift. Defines the center of the mask in the power versus time measurement.
H Off. Positions the center of the mask halfway between symbol 13 and 14 in
the training sequence.
H On. Aligns the center of the mask with symbol 14 in the training sequence.
Auto Carrier. Determines whether to activate the automatic carrier detection.
H On. Default. The carrier is automatically detected during data analysis.
H Off. No detection of carrier frequency is performed. Set the carrier frequency
offset in Frequency Offset below.
This menu item is unavailable in the switching spectrum measurement.
Frequency Offset. When Off is selected in Auto Carrier above, it is necessary to
set the carrier frequency offset with reference to the center frequency.
This setup item is unavailable in the switching spectrum measurement.
WCA230A & WCA280A Option 24 User Manual
2-5
Burst Analysis
Modulation Accuracy Measurement
Figure 2–2 shows an example of the modulation accuracy measurement.
H Overview: Power versus Time for the specified block
H Subview: Constellation for the specified burst
H Main view: Measurement results and EVM view
Pass/Fail status
Measurement results
H EVM (RMS/Peak/95
H Amplitude error (RMS/Peak)
H Phase error (RMS/Peak)
H Frequency error
H Origin offset (IQ feedthrough)
H Training sequence code
The pass/fail test item is
displayed in green when passed
or in red when failed.
th
percentile)
Figure 2-2: Modulation accuracy measurement
Changing Views. You can change the presentation of the overview, the subview
and the main view. Procedures to change the presentation of the overview or the
subview are common with those for the modulation analysis. Refer to the
WCA230A and WCA280A User Manual for the details.
To change the presentation of the main view, proceed as follows:
2-6
1. Press the VIEW: DEFINE key on the front panel.
2. Press the Mainview Content... side key and select the main view content:
H Constellation
H EVM (Error Vector Magnitude)
WCA230A & WCA280A Option 24 User Manual
Mean Carrier Power Measurement
Figure 2–3 shows an example of the mean carrier power measurement.
H Overview: Power versus Time for the specified block
H Subview: Constellation for the specified burst
H Main view: Power versus Time for the specified burst
The blue domain in the Power versus Time display on the right of the main view
shows the range of calculation process. The mean power, maximum power, and
minimum power are indicated on the left of the main view for each burst.
Burst Analysis
Burst number
Training sequence code
Figure 2-3: Mean carrier power measurement
Changing Views. You can change the presentation of the overview and the
subview. The procedures to change the presentation of the overview and the
subview are common with those of the modulation analysis. Refer to the
WCA230A and WCA280A User Manual for the details.
WCA230A & WCA280A Option 24 User Manual
Measurement results:
Mean power
Blue domain indicates
the range of calculation
2-7
Burst Analysis
Power versus Time Measurement
Figure 2–4 shows an example of the power versus time measurement.
H Overview: Power versus Time for the specified block
H Subview: Constellation for the specified burst
H Main view: Measurement results and the mask for the specified burst
The Power versus Time waveform and the GSM/EDGE standard mask are
shown on the right of the main view. The mean power as well as Pass/Fail status
of testing are shown on the left of the main view for each burst.
Pass/Fail status
2-8
Burst number
Training sequence code
Measurement results
H Mean power
H Pass/Fail
GSM/EDGE standard mask
Figure 2-4: Power versus Time measurement
Changing Views. You can change the presentation of the overview and the
subview. The procedures to change the presentation of the overview and the
subview are common with those of the modulation analysis. Refer to the
WCA230A and WCA280A User Manual for the details.
WCA230A & WCA280A Option 24 User Manual
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