doc.: IEEE 802.11-14/0259r0 Submission February 2014 Malik Kahn (Cohda Wireless) Slide 1 IEEE 802.11 Regulatory SC DSRC Coexistence Tiger Team V2V Radio Channel Models Date: 2014-02-21 N am e A ffiliations A ddress Phone em ail M alik Kahn Cohda W ireless 82-84 M elbourne St, N orth A delaide, SA 5006 A ustralia +61 8 8361 7297 malik.khan@ cohdawirel ess.com Authors:
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Doc.: IEEE 802.11-14/0259r0 Submission February 2014 Malik Kahn (Cohda Wireless)Slide 1 IEEE 802.11 Regulatory SC DSRC Coexistence Tiger Team V2V Radio.
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doc.: IEEE 802.11-14/0259r0
Submission
February 2014
Malik Kahn (Cohda Wireless)Slide 1
IEEE 802.11 Regulatory SCDSRC Coexistence Tiger Team
V2V Radio Channel Models
Date: 2014-02-21
Name Affiliations Address Phone email Malik Kahn Cohda Wireless 82-84 Melbourne St,
AbstractChannel models for vehicle to vehicle communications in
the 5.6-5.9GHz band.
February 2014
Slide 2
doc.: IEEE 802.11-14/0259r0
Submission
Background Work: References• Ian Tan, Wanbin Tang, Ken Laberteaux, Ahmad Bahai ,
“Measurement and Analysis of Wireless Channel Impairments in DSRC Vehicular Communications,” Electrical Engineering and Computer Sciences University of California at Berkeley, April 2008.
• Paul Alexander, David Haley, Alex Grant , “Cooperative Intelligent Transport Systems: 5.9-GHz Field Trials,” Proceedings of The IEEE Volume:99 , Issue 7, July 2011
• Laura Bernado, Thomas Zemen, Fredrik Tufvesson, Andreas F. Molisch, Christoph F. Mecklenbrauker , “Delay and Doppler Spreads of Non-Stationary Vehicular Channels for Safety Relevant Scenarios,” May 2013
3 Malik Kahn (Cohda Wireless)Slide 3
doc.: IEEE 802.11-14/0259r0
Submission
Merge methodology
• All studies were scenario based and at 5.6 to 5.9 GHz. Not all scenarios were in common.
• The antenna systems and transmitted power were different across tests
• All studies reported RMS Doppler and Delay Spread.
• Created a table with Scenario and RMS Delay and Doppler spread, then determined multipath Taps that deliver those statistics
Malik Kahn (Cohda Wireless)Slide 4
doc.: IEEE 802.11-14/0259r0
Submission
Scenario Descriptions
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Rural LOS:Intended primarily as a reference result, this channel applies in very open environments where other vehicles, buildings and large fences are absent.
Urban Approaching LOS:Two vehicles approaching each other in an Urban setting with buildings nearby.
Malik Kahn (Cohda Wireless)Slide 5
doc.: IEEE 802.11-14/0259r0
Submission
Scenario Descriptions
6
Street Crossing NLOS:Two vehicles approaching an Urban blind intersection with other traffic present. Buildings/fences present on all corners.
Highway LOS:Two cars following each other on Multilane inter-region roadways such as Autobahns. Signs, overpasses, hill-sides and other traffic present.
Highway NLOS:As for Highway LOS but with occluding trucks present between the vehicles.
Name Berkeley Cohda LundRuralLOS RuralLOS na Merging Lanes RuralUrbanApproachingLOS
UrbanLOS UrbanLOS street crossing - suburban without traffic
CrossingNLOS UrbanNLOS UrbanNLOS street crossing -urban single laneHighwayLOS HighwayLOS HighwayLOS naHighwayNLOS HighwayNLO
SHighwayNLOS general LOS obstruction - highway
Malik Kahn (Cohda Wireless)Slide 7
doc.: IEEE 802.11-14/0259r0
Submission
Doppler Spectra• The Delay and Mean Power of the taps is a strong function of the environment
whereas the Doppler frequencies can scale with speed stipulated as part of the scenario.
• We want asymmetric spectra, and thus the Doppler spectra is specified as half-bath tub. Other options are a uniform offset Classic Bathtub.
• The key attributes of these Doppler spectra are that they induce a significant bias to the instantaneous Doppler consistent with the constant macro dynamics of the scenario.
• For example two cars approaching a blind intersection will tend to compress frequency on the direct path but may stretch frequency on a reflected path of a following truck.
• The specified Doppler spectrum is Half bath tub. The Doppler of each tap changes with time and visits the extreme value (listed in the tables) with highest likelihood. It follows that the worst case instantaneous Doppler scenario could be obtained by using pure Doppler taps.
• Another point to note is that because these channel models were derived from the RMS Delay and Doppler spread there is no residual group Doppler or Delay remaining in the channel models. We do not view this as a problem from the device testing point of view. As both group delay and Doppler (frequency) are removed by receivers.