摘要
快速精确地实现传输时延的估计是突发数字通信中的研究重点和难点。研究了数字通信前馈算法中的最大似然同步算法,对最大似然同步算法的原理进行了分析,根据最大似然函数的不同,推导出4种不同的最大似然估计算法,并以QPSK调制方式为例,在Matlab环境下对4种算法进行了仿真,估计了各种因素对算法的影响。仿真结果表明,最大似然同步算法的估计精度高,估计范围广,满足突发通信的要求。
Transmission delay estimation is very important and difficult in the research of burst digital communication.The syn- chronization algorithm principle of maximum likelihood algorithm of feedback algorithm in digital communication is discussed.Based on the different maximum likelihood functions, four different maximum likelihood estimation algorithms are deduced, and they are simulated in Matlab environment with QPSK modulation adopted.The result of the simulation shows that the maximum likelihood algorithm has high estimation accuracy and wide estimation range ,which meets the requirements of burst communication.
出处
《无线电工程》
2016年第7期25-28,共4页
Radio Engineering
关键词
定时同步
最大似然算法
QPSK
timing synchronization
maximum likelihood algorithm
QPSK
