Cohda Wireless MK5OBU User Manual
CohdaMobility MK5 Module
Datasheet
Date:
May 2015
Version:
V1.2.0
Reference:
CWD-P0052-HWMDATA
-WW01-061
Prepared for:
Prepared by:
David de Haaij
Mike Sloman
Authorised By :
Fabien CURE
(Chief Engineer)
Distribution:
This document is offered in confidence and may not be used
for any purpose other than that for which it is supplied.
© Copyright Cohda Wireless Pty Ltd
ABN 84 107 936
309
COMMERCIAL-IN-
CONFIDENCE
Cohda Wireless Pty Lt
d
82
-84 Melbourne Street
North Adelaide
, SA 500
6 Australia
P +61 8 8364 4719
F +61 8 8364 4597
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Change Log
Version
Date
Comments
0.1
27/10/2014
Initial Version for Review
0.2
12/11/2014
Update following review feedback
0.9
5/12/2014
Issue for technical release
1.0
10/12/2014
Issue for release
1.1
01/04/2015
Review of nACR and ACR data
1.2
07/05/2015
Update LO Leakage and Block Diagram
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Table of Contents
Functional Description ............................................................................................ 6
1
1.1 Overview ......................................................................................................... 6
1.2 CohdaMobility MAC ......................................................................................... 7
1.3 Performance .................................................................................................... 8
1.3.1 Receiver Sensitivity .................................................................................... 8
1.3.2 Receiver Maximum Input Level .................................................................. 9
1.3.3 Transmitter Specifications .......................................................................... 9
1.3.4 Power Level and Spectral Mask............................................................... 10
1.3.5 Adjacent Channel Rejection ..................................................................... 13
1.3.6 Non-Adjacent Channel Rejection ............................................................. 14
1.3.7 Return Loss.............................................................................................. 15
1.3.8 Power Measurements .............................................................................. 15
1.4 Block Diagram ............................................................................................... 15
1.5 CohdaMobility DSRC Radio ........................................................................... 15
1.5.1 CohdaMobility PHY ................................................................................... 15
1.5.2 Reset ....................................................................................................... 17
1.5.3 GPIO ........................................................................................................ 17
1.5.4 1PPS ........................................................................................................ 17
1.5.5 USB ......................................................................................................... 17
1.5.6 Power Supplies ........................................................................................ 17
2 Pin Definition ........................................................................................................ 18
3 Example Circuit .................................................................................................... 21
4 Mechanical Specification ...................................................................................... 22
5 Reliability and Compliance ................................................................................... 25
5.1 ESD ............................................................................................................... 25
Regulatory Information ......................................................................................... 25
5.2 ............................................................................................................................ 25
6 Product Packaging and Handling ......................................................................... 26
7 Labelling ............................................................................................................... 27
7.1 Product Label: MK5 Module .......................................................................... 27
7.2 Label paste at Anti-Static bag and Pbox. ...................................................... 27
List of Tables
Table 1 - Key Features of the MK5 Module ................................................................................. 6
Table 2 - MK5 Module Receive Sensitivity .................................................................................. 8
Table 3 - Highway NLoS channel parameters .............................................................................. 8
Table 4 - General Transmitter Specification ............................................................................... 10
Table 5 - MK5 Module 5GHz Radio Transmitter Specifications ............................................... 10
Table 6 - Transmitter unwanted emission limits from 1GHz to 18GHz outside the 5GHz ITS
frequency bands ........................................................................................................................... 11
Table 7 - Adjacent Channel Rejection (ACR) ............................................................................ 13
Table 8 - Non-Adjacent Channel Rejection (nACR) .................................................................. 14
Table 9 - Permissible radio path configurations .......................................................................... 16
Table 10 - Module Pin Assignments ........................................................................................... 19
Table 11 - Example circuit Bill of Material ................................................................................ 21
Table 12 - MK5 Module environmental requirements ................................................................ 25
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Parameter
Specification
Frequency Bands
5.9 GHz
760 MHz
2.4 GHz (Future)
Transmit Power
5.9 GHz: -10 to +23 dBm
5.9 GHz: Class C
Receive Sensitivity
5.9 GHz: -97 dBm
@ 3Mbps
Antenna Diversity
5.9 GHz only:
CDD Transmit Diversity
MRC Receive Diversity
Bandwidth
10 MHz
20 MHz (Future)
Data Rates
3 to 54 Mbps
Power Supply
3.3V
5.0V
Power Consumption
4W (Max)
Temperature Range
-40ºC to +85ºC
Dimensions
40 (L) x 30 (W) x 4 (H) mm
Standards Conformance
IEEE 802.11p – 2010
ETSI ES 202 663
IEEE 1609.4 – 2010
1 Functional Description
1.1 Overview
The MK5 Module is designed to provide a compact platform for the deployment of advanced
connected vehicle applications which can exploit the significant performance of the
CohdaMobility Radio in mobile environments.
The MK5 Module is an automotive qualified single or dual channel CohdaMobility IEEE
802.11p radio, operating from -40C to +85C PCB ambient temperature.
The MK5 module is a complete IEEE 802.11p dual-antenna radio, incorporating Link-, MACand PHY Layers and 5.9GHz RF Front-End. It is a surface mount module that only requires
connections to 5.9GHz antennas, USB connection to a host processor, and power supply.
The key features of the MK5 Module are summarised in Table 1below.
Table 1 - Key Features of the MK5 Module
(Future)
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1.2 CohdaMobility MAC
The CohdaMobility MAC implements a full IEEE 802.11p compliant MAC layer, for one or
two independent radio channels. The MAC runs on the ARM processor of the SAF5100.
The CohdaMobility MAC provides fast, time-synchronised channel switching functionality. It
also provides support for multiple queue sets, allowing packets to be queued while the
PHY/MAC is operating on another channel.
The MAC provides the following operating modes:
- Single radio, single channel operation.
o Only one of the radios are used
- Single radio, time-synchronised multi-channel operation
o Channel switching between two channels with independent sets of transmit
queues.
- Dual radio, multi-channel operation
o Independent MAC/PHY entities operating concurrently on different radio
channels.
o Optional coordination between channels to avoid self-interference when
operating on close radio channels.
- Dual radio time synchronised multichannel operation.
o As above, plus one of the radios optionally performs channel switching between
two channels with independent sets of transmit queues
The CohdaMobility MAC provides full IEEE 802.11p support. Full support for MAC timesynchronisation is provided via an external GNSS receiver under software control or using an
external 1PPS signal.
Other features of the MAC include:
- Radio channel measurements
o Channel utilisation (ratio of channel busy time to measurement duration)
o Channel active ratio (proportion of time that the radio is tuned to the SCH or
CCH, respectively)
o Per-channel statistics (number of packets successfully transmitted, number of
packets that failed to transmit, number of packets successfully received, and
number of packets received in error. Broken down according to broadcast,
multicast, and unicast packets)
o Received signal and noise power levels.
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Channel
No Multipath [dBm]
Highway NLoS [dBm]
Number of Antennas
1
Typical (Min)
2
Typical (Min)
1
Typical (Min)
2
Typical (Min)
Rate ID
MCS
11
1/2 BPSK
-98 (-95)
-99 (-97)
-95 (-92)
-97 (-95)
15
3/4 BPSK
-96 (-93)
-98 (-96)
-92 (-89)
-95 (-93)
10
1/2 QPSK
-95 (-92)
-97 (-95)
-88 (-85)
-92 (-90)
14
3/4 QPSK
-93 (-90)
-95 (-93)
-86 (-83)
-89 (-87)
9
1/2 16QAM
-90 (-87)
-92 (-90)
-85 (-82)
-88 (-86)
13
3/4 16QAM
-86 (-83)
-88 (-86)
-82 (-79)
-85 (-86)
8
2/3 64QAM
-82 (-79)
-84 (-82)
na
na
12
3/4 64QAM
-80 (-77)
-83 (-81)
na
na
Tap #
Relative Power [dB]
Delay [ns]
Doppler Frequency [Hz]
0 0 0
0
1
-2
200
689
2
-5
433
-492
3
-7
700
886
1.3 Performance
1.3.1 Receiver Sensitivity
The receive sensitivity of the MK5 Radio is presented in Table 2 for single and dual receive
antennas, operating at 5.9GHz in DSRC 10MHz bandwidth mode. The packet error rate (PER)
is less than 10% at a PSDU length of 1,000 octets for these input levels. The receive sensitivity
is measured with a signal input directly to the antenna ports. Example plots are presented in
Figure 1 and Figure 2 overleaf.
Table 2 - MK5 Module Receive Sensitivity
The Highway NLoS (Non Line of Sight) channel parameters used to obtain the values in Table
2 are captured in Table 3 below.
Table 3 - Highway NLoS channel parameters
This channel was used in the RF testing at the third ETSI Plugtest (CMS3).
Each tap is faded using Pure Doppler, but the second antenna has a Doppler increased by 11Hz,
which prevents phase synchronization of the channels. The Rx Power listed in Table 2 refers to
the power of Tap 0.
The values presented are typical values, measured at +25°C. The sensitivity may be reduced by
approximately 1dB when operating at +85°C or -40°C.
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1.3.2 Receiver Maximum Input Level
The receiver maximum operating input level is -20dBm (the PER may exceed 10% for input
levels above this value).
The input level should not exceed 0 dBm to avoid damage.
Figure 1 - Receiver sensitivity for Antenna 1 (No RF multipath)
Figure 2 - Receiver sensitivity for Antenna 2 (No RF multipath)
1.3.3 Transmitter Specifications
Table outlines the transmitter specifications common to all operating modes of the MK5
Module Radio.
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