一种新的抑制多径干扰的DFE/RAKE接收技术研究

Study on a new kind of DFE/RAKE receive technology for suppresses the multipath interference

在超宽带(UWB)无线通信系统中,UWB信号通过多径信道传输后,会受到严重的多径干扰。提出一种基于自适应步长LMS算法的DFE/RAKE接收机,该接收机不仅能有效抑制多径干扰,而且能减少由多径干扰引起的符号间干扰(ISI)的影响。仿真结果表明,在相同条件下,该接收机与基于固定步长LMS算法的DFE/RAKE接收机和RAKE-MRC接收机相比有较低的误码率,提高了接收机的性能。

In the ultra - wide band （UWB） wireless communication system, UWB signal after the multipath channel transmission, will receive the serious muhipath interferences. A kind of DFE/RAKE receiver based on adapted step LMS algorithm, is proposed, which can not only suppress the muhipath interference effectively, but also reduce the influence of inter - symbol interference （ ISI）, caused by the muhipath interference. The simulation result Indicated that under the same condition, compared with DFE/RAKE receiver based on fixed step LMS algorithm and RAKE -MRC receiver, this receiver has the lower bit error rate, and enhance receiverg performance.