用于体全息存储系统的调制—阵列码的设计与实现  

Design and Implementation of Modulation-Array Code Used in Digital Holographic Storage

作　　者：敦书波[1] 贾克斌[1] 覃鸣燕[2] 陶世荃 

机构地区：[1]北京工业大学信号与信息处理研究室,北京100022 [2]北京工业大学应用数理学院,北京100022

出　　处：《测控技术》2002年第5期36-38,共3页Measurement & Control Technology

基　　金：国家 973计划项目 (G19990 3 3 0 0 1);国家自然科学基金资助项目 (699770 0 5 )

摘　　要：为克服传统体全息存储系统在读出数据的处理过程中信息利用率低的问题 ,提出了一种具有新的编码结构的改进调制码 :调制—阵列码 ,它是一种调制码与纠错码紧密结合的编码技术。同时采用了与其相适应的软判决度量方法。在此基础之上综合调制码探测、软判决、阵列码纠错和Turbo码译码原理 ,形成了一种新的迭代译码算法。初步实验结果表明 :在信道信噪比较低且有起伏 ,信道噪声参数不好统计的情况下 ,它能充分利用输入信号所包含的信息 。To overcome the low using factor of information in the digital holographic storage system,a novel code having modified coding structure,modulation array (MA) code,are proposed.The MA code introduces the error correcting code to the modulation code and makes the two sorts of code effect each other to get a fine performance.According to its character,we propose a novel soft decision metric and also develop a new iterative decoding algorithm, which integrates principles of modulation code detection,soft decision,array code error correction and Turbo code decoding.Using these techniques,a preliminary experiment has been completed.Experimental results show that when the signal to noise ratio in the channel is low and varying,and the noise parameters are difficult to calculate,this MA code can exploit the information contained in the input data effectively and the decoding results are satisfied.

关 键 词：体全息存储系统 阵列码 设计 调制码 软判决 迭代译码 

分 类 号：TP333.42[自动化与计算机技术—计算机系统结构]