车联网中基于非正交多址接入的簇重叠区域性能改进

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 ac-cess,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(Vehi-cle to Everything)网络中车辆SR的性能.

Performance Improvement of Cluster Overlap Region Based on NOMA for Internet of Vehicles Network

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) is proposed. In the proposed scheme, a maximum ratio combining (MRC) is 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 are analyzed for independent Rayleigh fading channels, and also their closed-form expressions are also provided. Numerical results corroborating our theoretical analysis show that the superposition coded signal transmission scheme applied to the proposed COR-NOMA improves the SR performance significantly in V2X Network.