改进的LMS-Rake接收机的性能

Performance of an improved LMS-Rake receiver

为了提高传统Rake接收机在无线通信系统中的性能,消除信号间的干扰和噪声,采用一种改进的基于最小均方误差(LMS)算法的Rake接收机,该结构针对传统的MRC-Rake接收机需通过增加分支数来提高性能,而MMSE-Rake接收机需要进行矩阵的逆运算的不足,利用LMS算法进行权值计算并对步长进行了改进.经过理论分析和仿真结果表明,LMS-Rake接收机较传统的MRC-Rake接收机的性能有较大的提高,并且结构简单、运算复杂度低、易于实现.

This paper proposes an improved LMS-Rake receiver structure to enhance the performance and reduce the intersymbol interference and noise in the wireless communication system. This structure aims at the deficiencies that the traditional MRC-Rake receiver needs to increase the number of branches to improve performance, and the MMSE-Rake receiver requires the matrix inverse operation. Through the LMS algorithm carried on the weight com- putation, the step computation also has an improvement. Theoretical analysis and computer simulations illustrate that the improved LMS-Rake receiver has significant improvement in performance when compared with the conventional MRC-Rake receiver. It has a simple structure, the calculation is not complicated and easy to implement.