Improved time-domain channel estimation techniques in IEEE 802.11p environments

Vehicle-to-infrastructure communication for accident avoidance is an important application defined in the IEEE 802.11p. The primary challenge in the current IEEE 802.11p draft standard is the weak performance of channel estimation (CE) in multipath environments due to insufficient pilot density. Therefore, we propose time-domain (TD) CE techniques that can effectively and accurately estimate channel tap-weighting coefficients for solving this problem. Two network traffic types are investigated in this study: periodic transmission and event transmission. In addition, the proposed TD techniques are able to perform remarkably improved CE while completely following the signaling format in the current standard, with the assistance of the symbol prefix.