EDSL传输系统中MQAM信号解调的定时恢复

Timing Recovery of MQAM Signal Demodulation in EDSL Transmission System

EDSL技术是我国具有自主知识产权的第三代宽带接入技术,在其采用的MQAM信号调制方式中,全数字解调端的定时恢复是关键技术之一。本文论述了插值法定时恢复的基本原理,介绍了一种基于Gardner定时误差检测算法的定时恢复方法,并做出适当改进以适合EDSL传输系统,给出了仿真结果,验证了方案的可行性。

Timing recovery is one of the key technologies in all-digital demodulator of MQAM signal in EDSL transmission system which China has independent intellectual property rights of third-generation broadband access technology. This paper discussed the basic principle of interpolation timing recovery, then introduced a timing recovery method based on Gardner timing-error detection algorithm and make appropriate improvements to fit EDSL transmission system. At last, this paper gave the simulation results to verify the feasibility of the method.