A Cooperative V2I Uplink Transmission Scheme Utilizing V2V Network Coding

摘要

Wireless communications in intelligent transport systems (ITS) require low-latency high-quality vehicle-to-infrastructure (V2I) transmission. However, fading due to vehicular movement sometimes causes transmission errors, resulting in repeated requests and high latency. A path diversity scheme for data transmission with multiple paths is effective in handling this problem. In addition, it is important that these transmissions should be conducted with a minimum number of resources to avoid signal traffic congestion. In this paper, we propose a novel cooperative V2I uplink transmission scheme that utilizes vehicle-to-vehicle (V2V) network coding, in which the need for additional resources is restricted by using analog network coding (ANC) or digital network coding (DNC). Cooperative communication improves the quality of the V2I transmission. We compare the performances of the required resources and the transmission quality for both schemes. In addition, we propose an iterative decoding scheme for ANC to improve the performance further. Numerical results show that the proposed scheme increases throughput and that the performance of ANC transmission is superior to that of DNC transmission despite that the former requires fewer resources when the average SNR of the link decreases.