Interleaving and mapping method of LDPC code words and de-interleaving and de-mapping method
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 system performance improvement
Inactive Publication Date: 2016-03-02
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 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 discloses an interleaving and mapping method of LDPC code words, and a de-interleaving de-mapping method. The interleaving and mapping method of the LDPC code words comprises the following steps of carrying out first bit interleaving on a check part in the LDPC code words so as to obtain a check bit stream; splicing an information bit part in the LDPC code words and the check bit stream into LDPC code words after first bit interleaving; dividing the LDPC code words after the first bit interleaving into a plurality of continuous bit sub-blocks according to a predetermined length, and transforming an arrangement sequence of the bit sub-blocks according to a corresponding bit exchange pattern so as to form LDPC code words after second 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 so as to obtain the LDPC code words after third bit interleaving; and carrying out constellation mapping on the LDPC code words after the third bit interleaving according to a constellation diagram to obtain a symbolic stream. Aiming at different LDPC code lists, the interleaving and mapping method and the de-interleaving and de-mapping method are selected so that system performance is increased.
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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IPC IPC(8): H04L1/00H04N21/2383
Inventor 张文军尧勇仕史毅俊徐胤徐洪亮何大治郭序峰赵杰杨帆
Owner SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION