Study on Distributed Delay Time Control Algorithm for Cooperative Multi-Hop Vehicular Networks with Cyclic Delay Diversity

Cooperative relaying is a promising technique that improves the end-to-end error performance in multihop vehicular networks. When cyclic delay diversity (CDD) is employed as transmit diversity at each hop, the control of the delay time introduced at each transmitting station improves the diversity gain. In this paper, a novel distributed delay time selection algorithm for cooperative multi-hop vehicular networks with CDD is proposed. In this algorithm, neither dedicated control packets nor an external controller for the delay time selection is required since the delay time is selected by overhearing the transmission in the next hop. Simulation results show that the proposed algorithm can achieve the end-to-end FER performance close to that of fixed delay time allocation, and is not sensitive to vehicles movements.