通讯信号波特率的盲估计  

Blind Estimation of Baud-rate of Communication Signals

作　　者：孙令明[1] 张爱春[1] 孙晓东[1] 

机构地区：[1]吉林大学通信工程学院,长春130025

出　　处：《长春理工大学学报（自然科学版）》2010年第3期75-79,共5页Journal of Changchun University of Science and Technology(Natural Science Edition)

摘　　要：阐述了一种用于在盲环境下估计线性调制通讯信号的波特率的方法。该方法首先用一个低通滤波器组来处理输入信号,并在每个滤波输出计算四阶循环矩函数,然后在每个循环矩函数上搜索满足一定条件的局域峰并以它们对应的频率作为波特率的候选值。在提取波特率候选值时,每一个候选值都会被赋予一个可信度来表示它隶属于波特率真值的程度,并将从各个循环矩函数所获得的具有相同值的候选频率将会被合并。最后,具有最大可信度值的候选频率将被作为波特率的估计。本文所介绍的算法的有效性已经被仿真所证实。This paper presents a method to estimate the baud-rate of a linearly modulated digital communication signal in blind environments. The proposed scheme fast filters the input signal by using a bank ef lowpass filters. For each filtered output, a fourth order oumulant function will be estimated, and its local peaks satisfying certain conditions will be selected as candidates of baud-rate line, where each candidate will be assigned a metric of confidence to denote its degree of belonging to the true baud-rate. Finally, candidates with a same frequency obtained from different filter outputs will be merged as one candidate, and the frequency of the candidate with the largest total metric of confidence will be taken as estimate of the baudrate. The proposed method has been validated via simulations.

关 键 词：波特率估计 数字通讯 线性调制 高斯白噪声信道 

分 类 号：TN911.7[电子电信—通信与信息系统]