Interleaving and mapping method and de-interleaving and de-mapping method for LDPC codes

Abstract

The invention provides an interleaving and mapping method and a de-interleaving and de-mapping method for LDPC codes. The interleaving and mapping method comprises the following steps: a check part in the LDPC codes is subjected to first bit interleaving, and check bit stream is obtained; LDPC codes after first bit interleaving are obtained by splicing an information bit part in the LDPC codes and the check bit stream; the LDPC codes after first bit interleaving are divided into multiple continuous bit sub-blocks according to predetermined length, the arrangement sequence of the bit sub-blocks is changed according to corresponding bit swap patterns, and LDPC codes after second bit interleaving are formed; the LDPC codes after second bit interleaving are written in according to a column sequence and are read according to a row sequence, and LDPC codes after third bit interleaving are obtained; the LDPC codes after third bit interleaving are subjected to constellation mapping according to a constellation diagram, and symbol stream is obtained. The interleaving and mapping method and the de-interleaving and de-mapping method are selected for different LDPC code tables, so that system performance can be improved better.

Description

[0001] This application is a divisional application of the original application, the application number of the original application is 201410439119.9, the application date is August 29, 2014, and the invention name is "LDPC codeword interleaving and mapping method and deinterleaving and demapping method". technical field [0002] 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 [0003] 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 meth...

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Problems solved by technology

[0004] 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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