Interleaving and mapping method and de-interleaving and de-mapping method of LDPC code word
A technology of LDPC code and mapping method, which is applied in the direction of digital transmission system, electrical components, error prevention, etc., to achieve the effect of improving system performance
Inactive Publication Date: 2017-10-20
SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION
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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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[0013] The inventors found that in the prior art, targeted bit interleaving cannot be formed for a specific LDPC codeword and constellation mapping manner.
[0014] 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.
[0015] 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.
[0016] In the embodiment of the present invention, the transmitter end is as follows: firstly input the bit stream after information source encoding and BCH encoding to an LDPC encoder to encode an LDPC codeword with a speci...
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The invention provides an interleaving and mapping method and a de-interleaving and de-mapping method of an LDPC code word. The interleaving and mapping method comprises the following steps: performing first time bit interleaving on a check part in the LDPC code word to obtain a check bit stream; splicing an information bit part and the check bit stream in the LDPC code word into an LDPC code word after the first time bit interleaving; dividing the LDPC code word after the first time bit interleaving into a plurality of continuous bit sub-blocks according to a predetermined length, and changing the arrangement sequence of the bit sub-blocks according to a corresponding bit exchange pattern to form an LDPC code word after second time bit interleaving; writing the LDPC code word after the second time bit interleaving according to a column sequence, and reading the LDPC code word after the second time bit interleaving according to a row sequence to obtain an LDPC code word after third time bit interleaving; and performing constellation mapping on the LDPC code word after the third time bit interleaving according to a constellation map to obtain a symbol stream. The interleaving and mapping method and the de-interleaving and de-mapping method are selected for different LDPC code tables to better improve the system performance.
Description
[0001] This application is a divisional application of the original application, the application number of the original application is 201410439117.X, 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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IPC IPC(8): H04L1/00H04L27/34H04N21/2383
CPCH04L1/0057H04L1/0071H04L27/34H04L27/3483H04N21/2383
Inventor 张文军徐胤徐洪亮郭序峰赵杰杨帆尧勇仕史毅俊
Owner SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION