基于PN序列信道估计的回波抵消研究

Echo cancellation research of channel estimation based on PN sequence

针对估计序列影响信道估计精度并影响回波抵消效果的问题,从回波抵消基本原理出发,分析了PN序列作用信道估计的机理及其相关性对信道估计参数的影响,并与采用输入信号自身作估计序列的回波抵消方式进行了比较。对输入OFDM信号进行了仿真和实际运行。结果表明,采用PN序列估计信道,能有效提高估计的精度,改善回波抵消效果。

For the problem of estimation sequence effect on channel estimation accuracy and echo cancellation effect, based on the basic principle of echo cancellation, the paper analysed the effect of PN sequence mechanism and the correlation on the channel estimation parameters comparing using the input signal itself as the estimation sequence. With the input signal OFDM , the results of simulation and actual operation show that the method can increase both the accuracy of channel estimation and echo cancellation effect effectively.