Method and apparatus for generating dc-free sequences with conveying partial information by the sequence of codeword digital sums of successive codewords

摘要

A method an apparatus generates a channel codeword based on codewords with arbitrary block digital sums. Respective portions of the channel codeword are generated based on respective sets of input symbols, and the channel codeword is generated from the portions in accordance with another set of input symbols which are used for determining the sequence of the digital sum of successive portions of the channel codeword. Thus this sequence is used for representing the other set of input symbols. The portions are advantageously codewords, comprising symbols, generated by selecting, for each set of input symbols, a codeword from a codebook and by adapting, as for example by ordering or by inverting symbols in, the codewords to form the channel codeword.