变步长LMS算法的超宽带Rake接收机设计  

Design of Rake Receiver Based on Variable Step-size LMS Algorithm

作　　者：胡俊杰[1] 张骏[1] 

机构地区：[1]西北工业大学自动化学院,西安710072

出　　处：《计算机测量与控制》2012年第7期1963-1966,共4页Computer Measurement &Control

基　　金：航天支撑基金(2009HTXGD)

摘　　要：在无线通信中,超宽带接收机的抗干扰性是接收系统的重要技术,而误码率是抗干扰性重要的评价指标;为了提高超宽带接收机的接收性能和抗干扰能力,设计了变步长LMS算法的超宽带Rake接收机;通过建立系统模型,分析LMS算法基本原理且提出改进思路,将改进的变步长LMS算法应用于Rake接收机,进行建模仿真;结果显示变步长LMS算法的Rake接收机接收性能提高,误码率迅速降低到10-1,有效改善了接收机抗干扰能力。Abstract： In wireless communication, the anti--interference performance of UWB receiver is an important technology in the receiving system, meanwhile the bit error rate is an important index of anti--interference performance. To improve the receiving performance and rein- force the capacity of combating with interference, this paper designs an UWB Rake receiver based on the variable step--size LMS algorithm. The procedure is composed of the following main parts： first build a system model, then construct a new Rake receiver by using the modified variable step--size LMS algorithm obtained from principle analysis, and last, simulate the performance of Rake receiver. The results show that the modified variable step--size algorithm can raise the performance of Rake receiver, the bit error rate decrease to 10-1 quickly as well as a stronger capacity of immunity from interference.

关 键 词：误码率 RAKE接收机 自适应滤波 LMS算法 超宽带 

分 类 号：TP302[自动化与计算机技术—计算机系统结构]