DSRC Vehicular Communications
Ian Nathaniel Lim Tan, Youwei Zhang, Carl Chun and Ahmad Bahai
The Federal Communications Commission (FCC) has allocated frequency spectrum between 5.850 and 5.925 GHz for dedicated short-range communications (DSRC) in vehicular environments. This allocation provides an ideal opportunity for automakers, government agencies, commercial entities, and motorists to work in concert to increase highway safety and provide transportation-related services. However, realizing this vision requires reliable, low-latency, wireless communication methods. The vehicular environment presents a number of challenges that must be understood and appropriately managed in order to enable reliable wireless communications. Our research seeks to characterize the wireless channel and understand the various types of impairments, and to ultimately provide improvements to DSRC communications.
In this past year, we developed a vehicle-to-vehicle GPS-enabled channel sounding platform. This platform was used to conduct an extensive field measurement campaign involving vehicular wireless channels across a wide variety of speeds and line-of-sight conditions. We developed a process for extracting channel models and characteristics from measurements. Time-frequency correlation techniques are applied to derive doppler and multipath of the wireless channel. From the data, we presented statistical characterizations of several classes of these channels at 5.9 GHz.
Our continued research will investigate adjacent channel interference issues, optimizations to the MAC layer, multi-hop communications, and development of a flexible test platform to demonstrate improved communication links. Our research will also investigate variations of OFDM for high speed vehicular communications.