利用广义旁瓣相消模型的多个窄带干扰盲抑制

Blind Suppression of Multiple Narrowband Interferences Using Generalized Sidelobe Canceler

针对宽带通信系统中存在多个窄带干扰以及干扰带宽相对较宽的问题,提出一种利用广义旁瓣相消模型的自适应盲干扰抑制方法.通过将期望信号检测器分解为约束项和非约束项(其中非约束项为期望信号特征波形,而约束项为期望信号特征波形正交空间列向量的线性组合),使得其对期望信号特征波形的响应始终为1,在最小输出能量准则下,仅自适应调整约束项的线性组合系数,达到检测到信号的同时抑制干扰的目的.理论和仿真结果表明,该算法对干扰信号模型不敏感.

For the problems of multiple narrowband interferences and interferences with relatively large band in wide-band communication systems, an adaptive interference suppression algorithm based on the model of the generalized sidelobe canceler（ GSC） is proposed. Constraining the detector to present a unit response to the desired user＇s signature sequence, the detector is decomposed into corresponding constrained and unconstrained components. The unconstrained item is the desired user＇s signature se- quence and the constrained item is the linear combination of the null space of the signature sequence of the desired user. In the principle of the minimum output energy, the algorithm adaptively adjusts the linear combination weights of the constrained item in order to suppress the interferences and detect the desired signal. Analysis and simulation show that the algorithm is less sensitive to the interference models.