单频网中继站自适应回波消除器的设计  

Dedign of an Adaptive Echo Canceller for the Relay Stations in a Single Frequency Network

作　　者：伍凌智[1] 王军[1] 阳辉[1] 潘长勇[1] 

机构地区：[1]清华大学数字电视传输技术研究中心,北京100084

出　　处：《电视技术》2006年第10期53-55,共3页Video Engineering

摘　　要：以数字电视地面广播国家标准为背景,提出一种在单频网通信系统中,通过专门电路对中继站回波干扰进行消除的方法。该方法通过对TDS-OFDM信号中的PN序列进行分析和计算,获取对回波干扰信道的估计,然后利用信道估计的结果生成一路反馈信号,用于逼近回波干扰信号,最后从接收信号中除去该反馈信号即实现回波消除。其中信道估计的过程是迭代的、自适应的。实验结果表明,该方法具有良好的回波消除性能。With the background of the National Standard for DTrB, we propose a time-domain adaptive cancellation method which is achieved by analyzing the PN sequence in the received TDS-OFDM signal to obtain an estimation of the impulse response of the coupling channel, and then using the estimation result to generate a feedback signal to cancel the echo. The process of channel estimation is adaptive and iterative. The results of computer simulation show that this method has a remarkable performance in echo cancellation.

关 键 词：数字电视地面广播 单频网 时域同步-正交频分复用 回波消除 自适应滤波 

分 类 号：TN948.5[电子电信—信号与信息处理]