摘要
针对数字体全息存储系统(DHSS)中复杂噪声的特点,从数字通信中信道编码的观点出发,讨论了采用数字信号处理方法来抑制DHSS中噪声干扰的技术。为了克服传统调制码的弊端,提出了一种适用于DHSS新的调制码:调制-阵列码的编译码方法及其相应的软判决度量方法。实验结果表明,这些方法对降低误码率发挥了作用,特别是集等重码、纠错码和迭代译码等优点于一身的调制-阵列码的应用,可将误码率降低一二个数量级,并成功地实现了多媒体视频流的存储和回放。
Based on the complicated noise characteristics in digital holographic storage system(DHSS), some methods of channel code in digital communication are introduced. In order to improve effect of traditional modulation code, a new modulation-array (MA) code and a novel soft-decision method corresponding to MA code are proposed for data processing in DHSS. Also developed based on the MA code is a new iterative decoding algorithm, which integrates principles of modulation code detection, soft-decision, array code error-correction and Turbo code decoding. The experimental results show that this MA code can be employed in the system and can reduce effectively the influence of noise.
出处
《北京工业大学学报》
CAS
CSCD
北大核心
2003年第3期296-300,共5页
Journal of Beijing University of Technology
基金
国家"973"计划基金(G1999033001)
关键词
数字体全息存储系统
数字信号处理
调制-阵列码
噪声
digital holographic storage system(DHSS)
digital signal processing(DSP)
modulation- array (MA) code
noise
