车联网中基于非正交多址接入的簇重叠区域性能改进

Performance Improvement of Cluster Overlap Region Based on Non-orthogonal Multiple Acess for Internet of Vehicles Network

由于车辆的高移动性和有限的移动范围,车辆分簇被认为是提高道路交通效率的一种有效方法。为了支持车联网中不断增长的业务量,提出了一种基于非正交多址接入技术的簇重叠区域(cluster overlap region with non-orthogonal multiple access,COR-NOMA)性能改进方案,该方案在目的车辆处利用最大比率合并(maximum ratio combining, MRC)来改进遍历和速率(sum-rate, SR),能有效降低相邻两个簇间冲突概率和传输延迟。分析了独立瑞利衰落信道下该方案的可达平均SR,并给出了其闭式表达式。数值结果验证了理论分析的正确性,所提出的COR-NOMA叠加编码信号传输方案能显著改善V2X(Vehicle to Everything)网络中车辆SR的性能。

Due to the high mobility and limited moving range of vehicles,vehicle clustering is considered as a promising solution to improve road traffic efficiency.In order to support the increasing traffic in Internet of Vehicles,a performance improvement scheme of cluster overlap region based on non-orthogonal multiple access(COR-NOMA)was proposed.In the proposed scheme,a maximum ratio combining(MRC)was utilized at the destination to improve the ergodic sum-rate(SR)and the probability of conflict and transmission delay can be reduced.The achievable average SR of the proposed scheme were analyzed for independent Rayleigh fading channels,and also their closed-form expressions were also provided.Numerical results verify the correctness of the theoretical analysis.The proposed COR-NOMA superimposed coded signal transmission scheme can significantly improve the performance of vehicle SR in vehicle to everything(V2X)network.