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Constructions of almost block-decodable runlength-limited codes

机译:几乎可块解码的游程长度受限代码的构造

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Describes a new technique for constructing fixed-length (d,k)runlength-limited block codes. The new codes are very close toblock-decodable codes, as decoding of the retrieved sequence can beaccomplished by observing (part of) the received codeword plus a verysmall part (usually only a single bit) of the previous codeword. Thebasic idea of the new construction is to uniquely represent each sourceword by a (d,k) sequence with specific predefined properties, and toconstruct a bridge of Β, 1⩽Β⩽d, merging bits betweenevery pair of adjacent words. An essential element of the new codingprinciple is look ahead. The merging bits are governed by the state ofthe encoder (the history), the present source word to be translated, andby the upcoming source word. The new constructions have the virtue thatonly one look-up table is required for encoding and decoding
机译:描述一种用于构造定长(d,k)游程限制的块代码的新技术。新代码非常接近块可解码代码,因为可以通过观察(部分)接收到的代码字加上前一代码字的很小一部分(通常只有一个比特)来完成对检索到的序列的解码。新结构的基本思想是通过具有特定预定义属性的(d,k)序列唯一表示每个源词,并构造Β,1lesd的桥梁,在每对相邻词之间合并位。新的编码原理的基本要素是展望未来。合并位由编码器的状态(历史记录),要翻译的当前源词和即将到来的源词控制。新结构的优点是编码和解码仅需要一个查询表

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