【摘要】 体全息存储系统的噪声特点决定了必然要引入纠错编码和调制编码技术。提出了一种具有新的编码结构的改进调制码:调制-阵列码;同时提出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,获得较好的解码结果。更多还原

【Abstract】 To effectively reduce the influence of noise in the digital holographic storage system,a novel code having modi-fied coding structure,Modulation-Array(MA)code,is proposed. Meanwhile, a new soft-decision metric is proposed. Accord-ing to its character, a new iterative decoding algorithm,which integrates principles of modulation code detect ion, soft-deci-sion, array code error-correction and Turbo code decoding, is also designed. 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 theinformation contained in the input data effectively and the decoding results are satisfied.更多还原