University of Southern California WiDeS - Wireless Devices and Systems Group The USC Andrew and Erna Viterbi School of Engineering USC


: "Toward Understanding Characteristics of Dedicated Short Range Communications (DSRC) for Vehicular Networks"
Speaker: Dr. Fan Bai
Affiliation: General Motors Corporation
Place/time: Thursday, November 15th, 2012, 10:00 AM – 11:00 AM, SAL 322

Abstract: IEEE 802.11p-based Dedicated Short Range Communications (DSRC) is considered a promising wireless technology for enhancing transportation safety and improving highway e ciency. We have studied the effects of the mobile vehicle-to-vehicle (V2V) channel on the current IEEE 802.11p standard to investigate how readily they can be applied to vehicular networks. In particular, measured parameters for the V2V channel at 5.9 GHz in suburban, highway, and rural environments are studied in the context of critical parameters for OFDM as implemented in the 802.11p waveform. Actual performance of scaled OFDM waveforms with bandwidths of 20 MHz (bandwidth of IEEE 802.11a), 10 MHz (bandwidth of the draft IEEE 802.11p), and 5 MHz (halved bandwidth of IEEE 802.11p) are described and interpreted in light of the channel parameters. At 20 MHz the guard interval is not long enough, while at 5 MHz errors increase from lack of channel stationarity over the packet duration. For these choices of the 802.11p OFDM waveform, 10 MHz appears to be the best choice. On the other hand, we also find that the performance of DSRC standard might degrade in a challenging V2V channel, partly because the IEEE 802.11p DSRC standard is not fully customized for outdoor, highly mobile channels. We develop a set of equalization schemes that are able to closely track the V2V channel dynamics and thus improve performance at the physical layer. Through a set of empirical experiments, we showed that the performance (in terms of Packet Error Rate) could be significantly improved from 39% (using a simple Least Square Estimator) to 17% (using a sophisticated Spectral Temporal Averaging Estimator).

Bio: Dr. Fan Bai (General Motors Global R&D) is a Senior Researcher in the Electrical & Control Integration Lab., Research & Development, General Motors Corporation, since Sep., 2005. Before joining General Motors research lab, he received the B.S. degree in automation engineering from Tsinghua University, Beijing, China, in 1999, and the M.S.E.E. and Ph.D. degrees in electrical engineering, from University of Southern California, Los Angeles, in 2005. His current research is focused on the discovery of fundamental principles and the analysis and design of protocols/systems for next-generation Vehicular Ad hoc Networks (VANET), for safety, telematics and infotainment applications.  Dr. Bai has published about 50 book chapters, conference and journal papers, including Mobicom, INFOCOM, MobiHoc, SECON, ICC, Globecom, WCNC, JSAC, IEEE Transaction on Vehicular Technology, IEEE Wireless Communication Magazine, IEEE Communication Magazine and Elsevier AdHoc Networks Journal. He received Charles L. McCuen Special Achievement Award from General Motors Corporation “in recognition of extraordinary accomplishment in area of vehicle-to-vehicle communications for drive assistance & safety.” He serves as Technical Program Co-Chairs for IEEE WiVec 2007, IEEE MoVeNet 2008, ACM VANET 2011 and ACM VANET 2012. He is an Associate Editor of IEEE Transaction on Vehicular Technology and IEEE Transaction on Mobile Computing, and he also serves as guest editors for IEEE Wireless Communication Magazine, IEEE Vehicular Technology Magazine and Elsevier AdHoc Networks Journal. He is also serving as a Ph.D. supervisory committee member at Carnegie Mellon University and University of Illinois – Urban Champaign.