数字全息数据存储系统中的格雷映射等重调制码的设计  

Design of Gray-Mapped Constant Weight Modulation Code for Digital Holographic Data Storage System

作　　者：裴先登[1] 陈端荣[1] 谢长生[1] 

机构地区：[1]华中科技大学计算机科学与技术学院,湖北武汉430074

出　　处：《电子学报》2003年第7期1015-1017,共3页Acta Electronica Sinica

基　　金：国家 973项目 (No G1 9990 330 0 6)

摘　　要：在数字全息数据存储系统的记录通道中 ,使用二进制映射等重调制码有利于信号的检测 .本文作者提出了 6:8格雷映射等重调制码的编码方案 ,将每 6比特数据视为一个格雷码字 ,而相应的等重码设计为具有 2单位距离特性 .当检测到的 8比特码字中发生一个 2码元交换错误时 ,该方案具有一定的容错能力 .误码性能的仿真结果表明 ,在系统的信噪比较低时 6:8格雷映射等重调制码优于Using a binary-mapped constant weight modulation code (BCWMC) for the recording channel of a digital holographic data storage system can facilitate the decision on the detected signal. The authors propose a new modulation coding scheme, 6:8 Gray-mapped constant weight modulation code (GCWMC), in which each digital data having length 6 is viewed as a Gray codeword and the constant weight code is designed with a characteristic of binary 2-unit distance. Thus the 6:8 GCWMC scheme can possess the ability of its all the 8-bit codewords to bear some error when a two-digit swapping event occurs in an estimated codeword. Simulation results show that the 6:8 GCWMC scheme can outperform the 6:8 BCWMC one in the bit-error rate (BER) performance at low signal-noise ratio (SNR) for the system.

关 键 词：全息存储 格雷码 等重码 调制码 

分 类 号：TN911[电子电信—通信与信息系统]