模糊步长的RAKE接收机仿真研究

Simulation Research on RAKE Receiver Based on Fuzzy Step

研究无线通信中多路径传播优化信号质量问题,针对传统的RAKE接收机需要通过增加分支来提高系统性能,提出了一种模糊步长LMS算法的自适应RAKE接收机,采用对抽头延迟线的权值进行自适应调整的方法可以有效地合并多径信号,克服多径干扰,并且消除信号间的干扰和噪声。对LMS算法的步长进行了改进,提出一种新的模糊步长的方法,以便提高LMS算法的收敛速度和降低稳态误差。在MATLAB上进行仿真。仿真结果表明,模糊步长的RAKE接收机性能优于传统的RAKE接收机性能。

The conventional RAKE receiver needs to increase the number of branches to improve the performance of the system.An adaptive RAKE receiver based on fuzzy step LMS algorithm was proposed in this paper.It used a method of adaptive adjust weights of tapped delay line,which could combine multi-path signals and overcome the multi-path interference effectively,and reduced the inter-symbol interference and noise.In this paper,the step of the LMS algorithm has been improved,a new method of fuzzy step was proposed in order to increase the speed of convergence and reduce the steady-state error.Simulation based on MATLAB,analyzed the performance of the traditional RAKE receiver and the RAKE receiver based on fuzzy step,and compared their BER.The simulation results show that fuzzy step RAKE receiver performance is better than the traditional RAKE receiver performance.