基于NOMA场景的多用户调度物理层安全性能分析

Security Performance Analysis of Multi-user Scheduling Physical Layer Based on NOMA Communication Scenario

针对NOMA系统传输模型,提出了基于NOMA通信场景下的多用户调度策略,对非窃听中继和窃听中继2种场景分别进行研究分析,推导计算出2种场景下OMA与NOMA系统安全中断概率数学闭合表达式,并进行对比分析。分析和仿真结果表明通过增加主信道信噪比(SNR)和发送用户数目可以有效提高系统安全性能,分析表明同等情况下基于NOMA系统的安全中断概率总是低于OMA系统,并且这种优势随着主信道SNR的增加、窃听信道SNR的减小而更加显著。

For NOMA system transmission model,this paper proposes a multi-user scheduling strategy in the NOMA communication scenario,studies and analyzes such two scenarios as non-eavesdropping and eavesdropping relay.The mathematical closed-form expressions of secrecy outage probability(SOP) of OMA and NOMA system are derived for these two scenarios.The analysis and simulation results show that the secrecy performance of the system can be effectively improved by increasing the SNR of primary channel and the number of users.The results also show that the SOP of NOMA system is always lower than that of the OMA system,and the advantage is more obvious as the SNR of primary channel increases and the SNR of eavesdropping channel decreases.