Low density parity check code (LDPC) word interleaving mapping method and LDPC word de-interleaving demapping method

Abstract

The invention provides a low density parity check code (LDPC) word interleaving mapping method and an LDPC word de-interleaving demapping method. The LDPC word interleaving mapping method comprises the steps of performing first bit interleaving on a verification part in the LDPC word for obtaining a verification bit stream; splicing the information bit part in the LDPC word with the verification bit stream for obtaining the LDPC word after first-time bit interleaving; dividing the LDPC word after first-time bit interleaving into a plurality of continuous bit sub-blocks according to a preset length and changing the arrangement sequence of the bit sub-blocks according to a corresponding bit exchange pattern for forming the LDPC word after second-time bit interleaving; writing the LDPC code after second-time bit interleaving according a row sequence and reading according to a line sequence for obtaining the LDPC code after third-time bit interleaving; and performing constellation mapping on the LDPC word after third-time bit interleaving for obtaining a symbol flow. The interleaving mapping methods and the de-interleaving demapping methods are selected for different LDPC lists so that system performance is improved.

Description

technical field [0001] The invention relates to the technical field of digital television, in particular to an LDPC codeword interleaving and mapping method and a deinterleaving and demapping method. Background technique [0002] In existing broadcast communication standards, LDPC coding, bit interleaving and constellation mapping are the most common coding and modulation methods. In different transmission systems, LDPC coding, bit interleaving and constellation mapping all need to be designed separately and jointly debugged to achieve the best channel performance. Therefore, how to form targeted bit interleaving for a specific LDPC codeword and constellation mapping method is a technical problem in the art. Contents of the invention [0003] The problem solved by the present invention is that in the prior art it is impossible to form targeted bit interleaving for specific LDPC codewords and constellation mapping methods. [0004] In order to solve the above problems, an...

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Problems solved by technology

[0003] The problem solved by the present invention is that it is impossible to form targeted bit interleaving for specific LDPC codewords and constellation mapping methods in the prior art

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