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.%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 reinforce 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.
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