工业脉冲干扰下多径衰落信道中的非线性RAKE接收机

The Locally Optimum RAKE in a Multipath and Fading Channelwith Impulsive Industrial Interference

针对多径衰落信道中出现强工业脉冲干扰时通信系统受到的严重影响,从信号枪测的局部最佳(L0)准则出发,导出了非线性RAKE接收机结构。分析比较了线性和非线性接收机的渐近性能,以及非线性函数对信道参数估计误差的影响。提出了采用线性预测器结构估计信道参数的方法和改进的自适应算法。理论分析和模拟结果表明,本文提出的非线性RAKE接收机在较低信噪比下的性能明显优于线性RAKE接收机。

A Non-linear RAKE Correlator is derived from the locally optimum criterion for suppression of strong industrial impulsive interference and providing maximum ratio combining simultaneously. Its asymptotical performance is analyzed,and is simulated on computer under different situations. Also channel coefficients estimation using linear predictor is proposed and simulated. Analysis and simulations show the large SNR gain achieved by using LOD non-linear function in RAKE correlator in low and moderate SNR situations.