High-Efficiency Full-Duplex V2V Communication

Abstract

For the safety of future traffics, vehicle-to-vehicle (V2V) communication should be able to ensure high reliability and low latency in a dense scenario. Device to device (D2D) transmission, or sidelink, is a promising technology which reduces the latency of base station transit and does not rely on the cellular coverage. There are some sensing-based methods to realize it. Among them, sensing-based semi-persistent scheduling (SPS) achieves a relatively better performance. However, in a high-density scenario, the reliability is hard to achieve due to miss reception and multiuser interference. In this paper, a distributed antenna deployment and a novel full-duplex V2V transceiver are proposed. The antenna deployment makes full duplex much easier to realize and increases the degree of freedom in spatial domain. The transceiver uses autonomous grant-free transmission not relying on reference signal to support a large amount of users with a very high spectrum efficiency. By sufficiently utilizing the user multiplexing abilities in power, code, spatial and constellation domain, the transceiver is able to support highly reliable transmissions especially for the short-range vehicles. The simulation results show the proposed method achieves a much better performance and meanwhile uses only 20% time-frequency resources compared with the conventional method. Moreover, the adaptability to highly dynamic V2V network is also verified to be much better.