LDPC codeword interleaving and mapping method 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 improving system performance
Inactive Publication Date: 2016-03-30
SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION
View PDF1 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
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
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[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 has provided an interleaving and mapping method and a deinterleaving and de-mapping method for LDPC codewords through research, and selects corresponding interleaving mapping and de-interleaving and de-mapping methods for different LDPC code tables to improve system performance. Nice boost.
[0014] In order to make the above objects, features and advantages of the present invention more clearly understood, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
[0015] In the embodiment of the present invention, the transmitter side is: firstly input the source code and the BCH-coded bit stream to the LDPC encoder to encode the LDPC codeword with a specific code rate and code length, and then input...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
An LDPC codeword interleaving and mapping method and a de-interleaving and de-mapping method are disclosed. Included are the steps of bit-interleaving a parity portion in an LDPC codeword for the first time to obtain a parity bit stream; splicing an information bit portion in the LDPC codeword and the parity bit stream into an LDPC codeword bit-interleaved for the first time; dividing the LDPC codeword bit-interleaved for the first time into a plurality of successive bit sub-blocks according to a predetermined length, and changing the arrangement sequence of the bit sub-blocks in accordance with a corresponding bit exchange pattern to form an LDPC codeword bit-interleaved for the second time; writing the LDPC codeword bit-interleaved for the second time in accordance with a column sequence, and reading out in accordance with a row sequence to obtain an LDPC codeword bit-interleaved for the third time; and carrying out constellation mapping of the LDPC codeword bit-interleaved for the third time 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 so that the system performance can be better improved.
Description
technical field [0001] The invention relates to the technical field of digital television, in particular to a method for interleaving and mapping of LDPC codewords and a method for deinterleaving and de-mapping. Background technique [0002] Among the 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 obtain the best channel performance. Therefore, how to form targeted bit interleaving for a specific LDPC codeword and constellation mapping mode is a technical problem in the art. SUMMARY OF THE INVENTION [0003] The problem solved by the present invention is that the prior art cannot form targeted bit interleaving for specific LDPC codewords and constellation mapping modes. [0004] In order to solve the above-mentioned probl...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04N21/2383
Inventor 张文军徐洪亮何大治郭序峰赵杰杨帆尧勇仕史毅俊徐胤
Owner SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION