预滤波式均衡器的原理和实现

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白适应均衡器组成。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。

Theory and implementation of pre-filtered equalizer

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.