基于DMB-T标准的数字电视Gap-Filler的回波抵消技术  

Echo Cancellation Technology Based on DMB-T Standard for Digital TV Gap-Filler

作　　者：张福洪[1] 张宁[1] 戴绍港[1] 

机构地区：[1]杭州电子科技大学通信工程学院,杭州310018

出　　处：《电子器件》2008年第6期1723-1726,共4页Chinese Journal of Electron Devices

摘　　要：以数字电视地面广播国家标准为基础,提出一种基于专用电路实现数字电视转发器中的回波抵消的方案。该方案利用数字电视信号中伪码保护间隔,通过相关算法获取该伪码的回波路径特性,进而该路径中相关的参数,最后利用得到参数来生成逼近回波信号的抵消信号,并从接收信号中减去该抵消信号达到回波消除的目的。仿真结果表明,该方法具有良好的回波消除性能,并具有一定实际应用价值。The article deseribes a scheme of actualizing echo cancellation on digital TV gap filler by using special circuit based on the National Standard for DMB-T. This Scheme makes use of the guard interval which is filled with known PN code in the DMB-T signals, obtains the echo path properties by employing the correlation algorithm and finally gets the relevant parameter of the echo path. In the end, it generates the cancellation signals close to the echo signals from the parameters, and then reaching the goal of getting echo cancellation by subtracting the cancellation signals from the received signals. The results of computer simulation show the favorable performance in echo cancellation and practical value in actual application.

关 键 词：DMB-T 回波消除 自适应滤波 伪码 

分 类 号：TN911.4[电子电信—通信与信息系统]