LDPC code encoding modulation method and apparatus

Abstract

The invention embodiment provides a coded modulation method for low density parity check code, a low density parity check code coded processing can be performed for an information sequence to obtain a code word, and the interweave processing can be performed for the code word, then the modulated processing can be performed for the code word by interweave processing; meanwhile, the invention embodiment also provides a coded modulation apparatus for the low density parity check code. The technical scheme disclosed by the invention embodiment is based on the importance of low density parity check code degree distribution, and the different bits on a star map in high order modulation have different reliabilities, and the excellent coded modulation gain can be obtained.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method and device for encoding and modulating a low-density parity-check code. Background technique [0002] Low Density Parity Check Codes (LDPC: Low Density Parity Check Codes) is a linear block code whose name comes from the sparsity of its check matrix, that is, the number of non-zero elements in each row (column) of the check matrix. The number is very rare, most elements are "O", and the positions of non-zero elements are distributed randomly. [0003] For an LDPC code with code length n and number of information bits k, its parity check matrix H (n-k)×n To describe, all codewords satisfy x·H T =0. Each row of the parity check matrix represents a parity check constraint, in which the symbol variable xj corresponding to all non-zero elements constitutes a parity check set, which is represented by a parity check equation; each column of the parity check matrix rep...

AI Technical Summary

Problems solved by technology

On the other hand, for high-order modulation, the bits mapped to the constellation diagram have different reliability, some bits have high reliability, and some bits have low reliability

However, the existing technology does not make full use of the above two points, so the optimal coding and modulation gain cannot be obtained

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