To compress data, the LZ77 algorithm replaces portions of the data with references to matching data that has already passed through both the encoder and the decoder.
为了压缩数据，LZ 77算法使用对匹配数据的引用来取代数据部分。匹配数据已经通过编码器和解码器传递。
The fourth chapter is this paper's emphasis , focuses on the byte processing part(outer code) module by module: data reverse transformer, de-randomizer, RS decoder, de-interleaver and synchronization.
第四章是本文的主要部分，开始分模块说明对字节处理部分的研究：数据格式反变换、解扰、RS译码、去交织和同步头搜索。
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