基于NOMA用户中继的卫星网络性能分析

Performance Analysis of NOMA User Relaying Based Satellite Network

为了满足大规模数据接入以及高通信质量的需求,文章研究了基于非正交多址接入(NOMA)用户中继协作的卫星网络,并分析了中继用户1和受助用户2的中断性能和系统吞吐量,同时也考虑了非理想信道状态信息(CSI)对系统中断性能和吞吐量的影响。最后,通过数值仿真验证了分析结果的正确性。与正交接入(OMA)策略相比,借助NOMA策略的卫星网络的中断性能得到了有效提升。随着信道估计误差平均功率的增加,用户1和用户2的中断性能和吞吐量不断下降。

In order to meet the requirements of massive connection data and high communication quality, satellite networks based on non-orthogonal multiple access(NOMA) user relaying are studied in this paper. The outage performance and system throughput for relay user(user 1) and aided user(user 2) is analyzed, and the effects of imperfect channel state information(CSI) on system outage performance and throughput is considered. Finally, the numerical simulation verifies the correctness of the analysis results. Compared with the orthogonal access(OMA) strategy, the outage performance of the satellite network employing NOMA is effectively improved. With the increase of the average power of channel estimation error, the outage and sum throughput performance for user 1 and user 2 decreases constantly.