协作干扰时频同步误差对安全通信性能影响

安全通信的前提是在授权接收机对协作干扰信号进行精准重建和对消,但因硬件和传播环境的影响,且受实际工程精度的制约,始终存在时频同步误差。因此,针对物理层安全通信中协作干扰抑制收发非完美时频同步问题,在高斯窃听信道模型下推导了存在时频同步误差的残余干扰功率,从理论上分析时频同步误差对系统性能的影响,得到了授权用户干扰抑制比、解调误码率和安全通信保密容量3个性能评价指标的闭合表达式,进而分析时频同步误差对这3个指标的影响,并对理论性能进行了计算机仿真验证。仿真结果显示,时频同步误差对系统安全性能的影响并不单一。随着时延或频偏增大,系统对协作干扰信号的抑制程度降低,授权用户干扰抑制比、保密容量降低,解调误码率增加;而在一定范围内,时频同步误差不会影响这3个指标性能。当信噪比为10 dB,归一化时延小于0.06且归一化频偏小于10^(-5)时,时延和频偏对系统安全通信的性能影响较小,保密容量损失小于16%。据此,分析时频同步误差对协作干扰安全指标产生的影响,可以为设计安全通信系统提供指导和理论支持。

Maximum Likelihood Estimation of Clock Synchronization Error in OFDM System

The performance degradation of an orthogonal frequency division multiplexing (OFDM) systems due to clock synchronization error is analyzed and a pilot-aided maximum likelihood (ML) estimating method is proposed to correct it. The proposed algorithm enables clock synchronization error estimation from a pilot whose duration is only two symbol periods. The study shows that this method is simple and exact. The clock synchronization error can be corrected almost entirely.