A two-dimensional constant-weight sparse modulation code for volume holographic data storage

In order to simplify the threshold determination,reduce the inter-pixel cross-talk,and improve the storage density for high-density volume holographic data storage,a two-dimensional constant-weight sparse modulation code is proposed.The evaluation criteria and design rules are investigated based on the page-oriented optical data storage system.Coding parameters are optimized to achieve large channel capacities.An 8:16 modulation code is designed to reduce the raw bit error rate and its performances are experimentally evaluated.A raw bit error rate of the magnitude of 10 4 is obtained with a single-data-page storage and 10 3 with multiplexing.

一种变阶次多阶游程受限调制码的特征分析

提出了一种变阶次多阶游程受限调制编码方案,在满足读出通道伺服控制及信道信噪比要求的同时,获得更好的编码效率,可以根据不同长度游程分阶时的信噪比裕量,设定不同的分阶限制条件:短游程少分阶或者不分阶,长游程多分阶。在最大限度地利用游程长度冗余的同时,降低了多阶游程造成的码间干扰影响。通过理论分析和实验测试,分析了该编码方案的特征性能,给出了该方案应用于DVD结构光盘的效果。实验结果表明,该编码方案的原始字节误码率达到了1×10-5量级,且读出信号具有良好的对称性,满足普通DVD光盘系统读出通道及伺服控制的要求。