【摘要】 该文针对协作NOMA系统中保密通信进行了研究,在该NOMA系统中,一个有高保密需求的用户(LU1)被多个非合作窃听者窃听,另一个普通用户(LU2)同时与基站(Alice)进行通信。为了提高系统的安全性能,在系统中引入了一个协作干扰者(Charlie)来扰乱窃听者。考虑更加贴近实际场景的非完美信道信息情况,基于LU1的保密需求和LU2的QoS要求,提出了一个自适应功率分配算法来解决安全速率最大化问题。仿真结果验证了该方案的有效性和灵活性,并且验证了非完美信道信息会降低系统安全性能以及能效。更多还原

【Abstract】 This paper studied secure transmission in cooperative non-orthogonal multiple access(NOMA)networks, where one legitimate user with high-level security requirement(LU1) is overhead by multiple noncolluding eavesdroppers(Eves), and another normal user(LU2) is served by the source(Alice) simultaneously.Aiming to improve the secrecy performance, a cooperative jammer(Charlie) is employed to confound the Eves. In this more practical communication scenario, take both secrecy outage restriction of LU1 and the desired quality of service(QoS) demand of LU2 into consideration, the paper propose an adaptive power allocation strategy for maximizing secrecy rate under imperfect channel state information(CSI). Numerical results are provided to verify the effectiveness of the proposed scheme and show that the system security would be seriously degenerated with channel uncertainty.更多还原