基于IRS-NOMA辅助的短包通信系统性能分析

Performance analysis of short-packet communication system based on IRS-NOMA

为了揭示短包数据在智能反射面(intelligent reflecting surface,IRS)和非正交多址接入(non-orthgonal multiple access,NOMA)技术辅助的通信系统中的传输性能,对短包通信系统性能进行深入研究.针对IRS具有理想相移和存在1 bit相位误差两种情况,借助短包通信相关理论和一阶黎曼积分法,获得近用户和远用户处平均误块率(block error rate,BLER)的解析结果;基于BLER的表达式,进一步分析系统吞吐量性能;利用蒙特卡洛仿真实验验证理论分析的正确性.结果表明:增加反射单元数目或增大信噪比都可显著改善短包传输的可靠性;相位误差对BLER和吞吐量的影响不容忽视.

In order to reveal the transmission performance of short-packet data in intelligent reflecting surface(IRS)and non-orthogonal multiple access(NOMA)technology-assisted communication systems,the performance of short packet communication system is deeply studied in this paper.Firstly,by utilizing the theory of short-packet communication and the first-order Riemann integral,the analytical results of the average block error rate(BLER)at the near user and the far user under the ideal phase shift and the case of 1 bit phase error for the IRS are obtained.Secondly,the system throughput performance is further analyzed based on the expression of BLER.Finally,the correctness of the theoretical analysis is verified by Monte-Carlo simulation.The simulation results show that both increasing the number of reflecting elements and increasing the signal-to-noise ratio can significantly improve the reliability of short-packet transmission,and the effects of phase error on BLER and throughput cannot be neglected.