基于QAM的协作通信系统物理层认证技术OACSTPCD

A quadrature amplitude modulation(QAM)based cooperative physical layer authentication mechanism was proposed for the identity authentication in two-user cooperative communication systems.In the proposed mecha-nism,two single-antenna users transmitted their own messages and tags as well as those of the partner with the in-phase component and orthogonal component,respectively.Thus,the messages and tags of two users could be u-niquely decomposed.Maximal ratio combining was employed at the base station to detect the messages and tags,and physical layer identity authentication was performed through tag comparison.In a typical scenario with equal power distribution and symmetric user uplink channels,the closed expressions of symbol error rates of message and tag were derived.The simulation results showed that the authentication probability of the proposed mechanism was improved by 12％-20％compared with the non-cooperative physical layer authentication when the signal-to-noise ratio(SNR)was 6-15 dB.Meanwhile,the authentication probability of illegal attack remained only around 10-3.Consequently,the proposed mechanism had better authentication performance.