预滤波式均衡器的原理和实现  

Theory and implementation of pre-filtered equalizer

作　　者：董斌[1] 王匡[1] 仇佩亮[1] 归琳[1] 

机构地区：[1]浙江大学信息与电子工程学系,浙江杭州310027

出　　处：《通信学报》2003年第11期133-140,共8页Journal on Communications

基　　金：国家"九五"重大科技产业工程项目(96-B06-01-05)

摘　　要：提出了一种新的均衡器——预滤波式均衡器。这种均衡器由预滤波器和自适应均衡器组成。它利用高效的相关估计算法,计算出所有多径的时延和幅度,然后使用多径拆分算法,设置预滤波器的参数,使得接收信号经过预滤波之后,畸变得到了改善,进而可由后面的自适应均衡器将残余的码间干扰完全消除。结果表明,在性能上它比传统均衡器有显著提高,可以补偿幅度为0dB的副径。A new equalizer called pre-filtered equalizer is presented. It comprises a pre-filter and an adaptive equalizer. With the efficient algorithm of correlation estimation, time delay and amplitude of all multipath have been known. Then the parameters of the pre-filter are calculated with the help of the algorithm of multipath separation. The aberrance is reduced after the received signal pass through the pre-filter. At last, the remainder of ISI(intersymbol interference) is compensated by the adaptive equalizer. As the result shows, pre-filtered equalizer has greatly improved performance compared with conventional equalizer, and it can compensate the subpath whose amplitude is equal to that of the mainpath.

关 键 词：无线通信技术 预滤波式均衡器 相关估计算法 多径拆分算法 高清晰度电视 

分 类 号：TN92[电子电信—通信与信息系统]