逆滤波器设计中若干基本问题的探讨  

Some Basic Problems for Inverse Filter Design

作　　者：曲万春 何国荣 梅铁民[1] QU Wanchun;HE Guorong;MEI Tiemin(Shenyang Ligong University,Shenyang Liaoning 110159,China)

机构地区：[1]沈阳理工大学,辽宁沈阳110159

出　　处：《通信技术》2021年第4期779-785,共7页Communications Technology

摘　　要：在信道均衡、语音去混响等应用中,逆滤波是一种常规处理手段。基于系统辨识获得的系统参数进行逆滤波器设计时,需要考虑逆系统的信道数、逆系统冲激响应长度以及全局响应时延优化和噪声稳定性3个基本问题。基于最小均方误差逆滤波器设计框架,推导并分析了3个基本问题在SISO、SIMO系统下的不同情况,并通过仿真模拟实验验证了所给结论的正确性。研究表明,逆滤波器可以通过对全局响应时延优化来改善逆系统性能,设计出对噪声鲁棒性更好的系统。Inverse filtering is often used in applications such as channel equalization and speech dereverberation.Some basic problems have to be taken into account during inverse filter design with identified system parameters:the channel number of the inverse filter,the length of the inverse filters,and the optimal time-delay of the global impulse response and noise robustness.Based on the design framework of inverse filter with minimum mean square error,the different situations of three basic problems in SIO and SIMO systems are deduced and analyzed,and the correctness of the conclusions is verified by simulation experiments.The results indicate that the inverse filter can improve the performance of the inverse system by optimizing the global response delay,and design a system with better noise robustness.

关 键 词：信道均衡 去混响 逆滤波 全局响应 MINT定理 噪声稳定性 

分 类 号：TN911[电子电信—通信与信息系统]