基于PR信道的BCJR检测

为了满足磁盘存储系统的高数据传输速率和高数据存储密度的需求，造成数字序列之间产生的码间干扰成为接收端获得可靠信息的主要阻碍。本文是以部分响应信号作为离散时间的ISI信道模型，采用基于MAP算法的对数域BCJR（log—MAP）算法进行信道检测。文章介绍了PR信道的模型，对算法的检测原理进行理论分析，并给出几种不同的部分响应信道下的计算机仿真。结果表明该算法能有效地对ISI信道进行检测，能应用于磁记录系统。

BCJR detections over several partial response channels

In order to meet the requirements of high data transfer rate and high data storage density in disk storage systems,the ISI(intersymbol interference)has become the main hindered to get reliable information.In this paper,we considered the partial response signaling as a discrete-time channel model with ISI,and the channel detection adopted the MAP-based algorithm of log-domain BCJR(log-MAP)algorithm.This article introduced the model of PR channel as well as the detection principle with theoretical analysis and computer simulation of several different of PR channels.The results show that the log-BCJR algorithm can effectively detect ISI channels,it could be used in magnetic recording system.