用于体全息存储系统的纠错编码及数据交错技术

INTERLEAVING AND ERROR CORRECTING IN VOLUME HOLOGRAPHIC DATA STORAGE

体全息存储系统具有存储容量大、数据传输率高、存取时间短和可快速进行图像匹配及内容相关寻址操作等特点 .但要成为特性优良的通用型信息存储系统 ,就必须以可接受的误码率同时满足这些性能指标 (计算机外存储器的基本要求是使用户误码率低于 10 - 12 ) .如此 ,仅靠光学设计不是高性价比方法 .设计恰当的纠错编码和数据交错技术可以减轻对原始误码率的要求 ,缓解对系统设计、部件质量等方面的要求 ,在不牺牲其它系统目标的情况下 ,使 10 - 5的原始误码率达到 10 - 12的最终误码率水平 .

Volume holographic storage has the potential to offer high density, fast data readout, and associative content addressable storage. But in order to make it a general-purpose data storage system, it is very important to attain these desirable goals simultaneously with the acceptable bit error rate (BER)(10 -12). Careful engineering of the optics alone is not generally the most cost-effective solution to reducing the BER to the target value. A properly designed error correcting code and interleaving can alleviate the requirements for the BER,relax the requirements for system design and quality of the components, and correct a 10 -5 raw BER to the 10 -12 level without sacrificing other system goals. Studied in this paper are the noise and error sources in digital volume holographic data storage channel, and the error-correcting codes and the two-dimensional interleaving for volume holographic storage systems.