一种新的无线超宽带(UWB)接收机及其与RAKE接收机的比较  

A new UWB receiver and the performance comparison with RAKE

作　　者：赵为春[1] 刘丹谱[1] 乐光新[1] 

机构地区：[1]北京邮电大学电信学院,北京100876

出　　处：《电路与系统学报》2006年第5期31-36,共6页Journal of Circuits and Systems

基　　金：863基金项目(2003AA123240)

摘　　要：本文提出一种新的UWB接收机。该接收机采用最大似然算法从接收信号中获得本地相关函数,从而改善了接收匹配滤波器的输出性能。与传统的RAKE接收相比,该方案减少了由于信号不匹配引起的接收能量的损失,同时无需对信道参数进行估计,使实现方法更加简单。仿真结果表明该方法在低信噪比下性能与RAKE接近,在高信噪比下明显优于RAKE的性能。To literatures about UWB to date, the receive structure is mainly based on RAKE receiver. The local template wave in demodulator is the same one as the transmitting wave, which will bring a lot of loss of power, especially in the multipath environment which the received pulses are overlapped. We develop a new receiver in which the local reference signal is gotten by maximum likelihood algorithm to make it match the received signal well. This receiver doesn＇t need channel estimation like RAKE and can be easily implemented. The analysis and the simulation show that this method has BER advantage over the traditional UWB RAKE receiver with Maximal Ratio Combining at high SNR.

关 键 词：UWB 同步 本地相关函数 RAKE接收机 估计 最大似然估计 

分 类 号：TN911[电子电信—通信与信息系统]