Interleaving and mapping method and deinterleaving and demapping method of ldpc codeword
A technology of LDPC code and mapping method, which is applied in the direction of digital transmission system, error prevention, multi-carrier system, etc., to achieve the effect of system performance improvement
Active Publication Date: 2019-11-26
SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION
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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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[0012] The inventors found that in the prior art, targeted bit interleaving cannot be formed for a specific LDPC codeword and constellation mapping manner.
[0013] In view of the above problems, the inventor provides an interleaving and mapping method and a deinterleaving and demapping method for LDPC codewords after research, and selects the corresponding interleaving and demapping and deinterleaving and demapping methods for different LDPC code tables so that the system performance can be improved. nice boost.
[0014] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0015] In the embodiment of the present invention, the transmitter side is: first input the source coded bit stream to the LDPC encoder to encode the LDPC codeword with a specific code rate and code length, and then input th...
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The present invention discloses an interleaving mapping method of LDPC code words, and a de-interleaving de-mapping method of the LDPC code words. The interleaving mapping method comprises the steps of dividing a check part in the LDPC code words into two check parts; carrying out the first time bit interleaving on the two check parts to obtain two check bit streams; splicing an information bit part and the two check bit streams into the LDPC code words after the first time bit interleaving; dividing the LDPC code words after the first time bit interleaving into a plurality of bit sub-blocks according to a predetermined length, and transforming the arrangement sequence of the bit sub-blocks according to a bit swap pattern to form the LDPC code words after a second time bit interleaving; writing in the LDPC code words after the second time bit interleaving according to a column sequence, and reading out the LDPC code words according to a row sequence to obtain the LDPC code words after a third time bit interleaving; and carrying out the constellation mapping on the LDPC code words after the third time bit interleaving according to a constellation diagram to obtain a symbolic stream. By selecting the interleaving mapping and de-interleaving de-mapping methods to aim at different LDPC code word tables, the performance of a system can be improved better.
Description
technical field [0001] The invention relates to the technical field of digital television, in particular to an interleaving and mapping method and a deinterleaving and demapping method of LDPC codewords. 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...
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IPC IPC(8): H04L1/00H04L27/32
Inventor 张文军史毅俊管云峰何大治徐胤郭序峰
Owner SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION