Interleaving and error-correcting method for reducing bit error rate of volume hologram storage system

Abstract

The invention relates to an interleaving and error-correcting method for reducing bit error rate of a volume hologram storage system, comprising the following steps of: (1) firstly, carrying out error correction coding on data to be stored from three dimensionalities including a row direction, a line direction and among data pages; (2) after error correction coding, carrying out matching interleaving within data pages, and then carrying out block interleaving among the data pages to rearrange the sequence among the data pages; and (3) restoring the data obtained in the volume hologram storagesystem into original data by sequentially carrying out detection and postprocessing, demodulation and de-interleaving, and clearing error correction codes. In the invention, because the methods of matching interleaving among within pages and block interleaving among data pages are adopted and the Reed Solomon error correcting code is used for error correction from three dimensionalities, the influence of nonuniform distribution of bit error rate within pages and among data pages is eliminated, burst errors are overcome, random errors are corrected, and iteration decoding can be carried out inthree directions so that the bit error rate after correction is greatly reduced. The invention can be widely applied in various error modes of volume hologram storage channels.

Description

technical field [0001] The invention relates to an interleaving and error correction method in the technical field of volume holographic data storage, in particular to an interleaving and error correction method applicable to various error modes of channels for reducing the bit error rate of a volume holographic storage system. Background technique [0002] Compared with other data storage technologies such as CD, DVD and hard disk storage technologies, volume holographic storage has the advantages of large capacity, high density, fast readout speed, etc., and has unique content addressing function, but the reliability of data needs to be improved. A volume holographic storage system can be regarded as a channel full of noise, called a volume holographic data storage channel. There are many noise sources in the volume holographic data storage channel, and various noises may cause errors in the judgment or decoding of the received data page, and ultimately affect the reliabil...

AI Technical Summary

Problems solved by technology

Although the two-dimensional matching interleaving method can overcome the uneven distribution of errors within the page, it does not consider the uneven distribution of errors between data pages and the problem of error correction, and its application range is still limited

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