DSSS通信系统中干扰环境下码捕获和阵列权值联合捕获

Joint Acquisition of PN Code and Beamforming Weight in DSSS Systems with Antenna Array Under Jamming

提出了空时相关器 (STC)方法 ,同时实现干扰环境下使用自适应阵列的直接序列扩谱 (DSSS)通信系统的码捕获和自适应阵列波束形成权值捕获 ,在码捕获时通过波束形成抑制干扰提高检测性能 .对干扰环境下空域最优合并方式的检测性能进行了理论分析 ,仿真结果与理论预测一致 ,分析结果表明STC可同时有效的捕获码定时和自适应阵列权值 ,最优合并方式的虚警概率与干扰和背景噪声功率无关 。

A novel approach called spatial-temporal correlator (STC) for joint acquisition of PN code and beamforming weight is proposed for DS-Spread Spectrum (DS-SS) systems with adaptive array under jamming. The proposed STC exploits adaptive beam-forming to suppress the interference during code acquisition and improves the detection performance. Detection performance of optimum combining under jamming is theoretically analyzed. Simulation results agree well with that of theoretical prediction, and the results show that the STC approach is effective and has improved performance for code acquisition and beamforming weight acquisition. The false alarm probability of optimum combining in STC is independent of the jamming power and background noise power and constant false alarm rate (CFAR) is achieved.