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

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.