Interleaved mapping method for coded modulation of protograph LDPC code
A technology of LDPC code, coding and modulation, applied in digital transmission systems, electrical components, error prevention, etc., can solve the problem of no P-LDPC code, etc., and achieve the effect of improving bit error performance
Inactive Publication Date: 2014-11-26
XIAN INSTITUE OF SPACE RADIO TECH
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At present, the interleaving mapping method for P-LDPC codes mainly adopts the above-mentioned water injection interleaving mapping or reverse water injection interleaving mapping, and mainly for nodes based on 4 types of prototype graphs corresponding to 2 4 -Specific equivalence such as QAM modulation, there is no general P-LDPC code and modulation method
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[0028] The basic idea of the present invention is: for the interleaving design based on P-LDPC code coding modulation, according to the unequal characteristics of the coding protection degree of the variable node to be transmitted in the P-LDPC code prototype diagram and the high-order modulation constellation bit reliability, priority Protect the heaviest variable nodes, followed by variable nodes with a weight of 1, then variable nodes with a weight of 2, and finally variable nodes with other weights.
[0029] In order to make the content and technical means of the present invention more clear and complete, the present invention will be further explained in detail below in conjunction with the accompanying drawings.
[0030] In this implementation, a typical QAM modulation and Gray mapping mode is taken as an example for introduction.
[0031] Such as Figure 4a As shown, there are p+1 variable nodes on the prototype graph of the defined P-LDPC code, which are marked as {...
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An interleaved mapping method for coded modulation of a protograph LDPC code. Firstly, q bits of constellation mapping points are sequenced according to modulation reliability; p variable nodes in a P-LDPC code protograph which represent actual transmission are divided and sequenced according to weight, and the sequence is: the heaviest variable nodes; variable nodes whose weight is 1; variable nodes whose weight is 2; and variable nodes whose weight is between 2 and the weight of the heaviest nodes. np code bits output by an encoder are sequenced according to the abovementioned weight sequence of the variable nodes, thereby obtaining an interleaved sequence. The interleaved sequence is sequentially and equally divided into q bit segments, and each segment has m=np / q bits; and the divided q code bit segments are sequentially allocated to q modulating constellation bits. A bit is sequentially selected from each bit segment in sequence, thereby forming a modulation symbol including q bits, and m modulation symbols are formed in total.
Description
technical field [0001] The invention relates to an interleaving and mapping method for encoding modulation of a prototype low-density parity check (P-LDPC) code, and belongs to the technical field of channel encoding and modulation in digital communication. Background technique [0002] The task of wireless communication systems is to provide high-speed and error-free transmission of information using limited bandwidth. For typical wireless communication systems with limited power and bandwidth, channel coding and modulation are important guarantees for transmission reliability and spectrum efficiency. Advanced channel coding technology can effectively improve the reliability of the system, and in the case of limited wireless link resources, the use of high-order modulation technology is undoubtedly one of the effective means to improve the utilization of system spectrum resources. [0003] However, with the increase of the modulation order, the Euclidean distance between t...
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IPC IPC(8): H04L1/00
Inventor 窦金芳李小军周诠谭庆贵蒋炜梁栋朱忠博
Owner XIAN INSTITUE OF SPACE RADIO TECH