基于单源最优路径的NOMA中继选择与协作传输

目前,在非正交多址接入(non-orthogonal multiple access,NOMA)中继通信的研究中,中继用户的选择是随机的,并没有考虑中继节点之间信道条件的差异.为了得到信道条件较好的中继用户,提出一种基于单源最优路径的中继选择策略,从基站广播信号以用户为节点,设定信道参数,寻找最佳传输通路.当信号到达目...

NOMA relay selection and cooperative transmission based on single source optimal path

Current non-orthogonal multiple access (NOMA) relay communication uses the random relay selection strategy without considering the differences in channel conditions between relay nodes. In order to provide relay users with better channel conditions, a new relay selection strategy based on a single source optimal path is proposed. The strategy starts with the signal broadcasting from base stations and treats users as nodes. Channel parameters are configured to find the best transmission path. After the signal reaches the target node, the base station collects all the reachable paths and performs a comparison of the channel parameters to find the best transmission path. Combining the proposed strategy with non-opportunistic NOMA, a new cooperative transmission method is obtained. This method eliminates redundant signals during relay transmission, thus the inter-signal interference is reduced. Simulation results show that the proposed method can achieve lower user outage probability and system complexity than the random relay selection strategy under the same conditions.