基于附加信号的回波抵消技术研究  

Research of Echo Cancellation Technique Based on Additional Signal

作　　者：王振朝[1] 包伟华[1] 李会雅[1] 

机构地区：[1]河北大学电子信息工程学院,河北保定071002

出　　处：《电视技术》2013年第17期220-223,共4页Video Engineering

基　　金：奥维通信股份有限公司委托研究项目"移动通信直放站关键技术研究"子课题;2012年保定市科学技术研究与发展指导计划项目(12ZG016)

摘　　要：研究了基于附加信号的回波抵消技术。首先,给出了基于附加信号的回波信道估计算法。然后针对此算法中存在的由于迭代误差累积导致信道估计误差较大的问题,提出了设置恰当的阈值和从主径开始估计信道的两种解决措施。然后重点阐述了后一种解决措施。通过MATLAB仿真测试,此算法有效地完成了回波抵消。In this paper, the echo cancellation technique based on additional signal is researched. First, the echo-channel estimation method based on additional signal is given. Then in order to solve the problem that iteration error accumulation lead to increase channel estimation error in the algorithm, two kinds of solution, setting appropriate threshold and estimating the channel from the main path are proposed. Finally, the second method is elaborated. Through the MATLAB simulation, the algorithm completes the echo cancellation effectively.

关 键 词：附加信号 回波抵消 迭代误差 

分 类 号：TN911.7[电子电信—通信与信息系统]