An empirical study of short range communications for vehicles
Proceedings of the 2nd ACM international workshop on Vehicular ad hoc networks
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Wireless Access in Vehicular Environment (WAVE) communications standards have recently been approved for trial use and other standards, such as 802.11p, are under active development. However, providing reliable communication services in the vehicular environment still remains a challenging task. Thus efficient solutions are needed to increase robustness and performance. This paper presents a new distortion-optimized transmission algorithm which exploits the non-uniform importance of multimedia data to optimize the transmission of video data captured by on-board cameras to another vehicle in proximity, using ad hoc 802.11 wireless technology and the H.264 video coding standard. A low delay video communication is simulated using actual intervehicle packet loss traces. The results show that the proposed system achieves higher quality video communication (up to 2 dB PSNR) compared to two reference techniques, i.e. the standard MAC-layer retransmission scheme and a delay-constrained retransmission technique.