非合作直扩信号检测中的相关函数二阶矩方法

摘要

Correlation estimator is widely exploited to realize spread spectrum signal detection,because of many advantages,such as less computation cost and making full use of the statistic character of signal and noise.A unified signal model,which is suitable to direct sequence spread spectrum (DS/SS) signal,direct sequence code division multiple access (DS/CDMA) signal,multi-rate DS/CDMA signal and multi-carrier DS/ CDMA signal,is established.Then,according to the principle of second-order moment of autocorrelation,the theoretical value which is contributed to the unified model signal is deduced and the establishment of condition for classic literature is pointed out.Finally,simulation results demonstrate the validity of the algorithm.%相关函数二阶矩方法因其具有计算量小、可充分利用信号与噪声统计特性等优势,被广泛应用于扩频信号检测中.针对目前各种直扩体制,本文首先建立了适用于直接序列扩频(direct sequence spread spectrum,DS/SS)信号、直扩码分多址(code division multiple access,DS/CDMA)信号、多速率(multi-rate,MR) DS/CDMA信号以及多载波(multi-carrier,MC) DS/CDMA信号的统一模型,然后分析了相关函数二阶矩用于直扩信号检测的原理,推导得出了直扩信号相关函数二阶矩的理论值,指出了经典文献中理论分析成立的条件,最后通过仿真试验验证了该方法的有效性.