用于体全息存储系统的纠错编码及数据交错技术

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 .研究了体全息存储通道中的噪声源及适用于体全息存储系统的纠错编码和数据交错技术

INTERLEAVING AND ERROR CORRECTING IN VOLUME HOLOGRAPHIC DATA STORAGE

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.