Decoding system of low-density parity-check code

Abstract

The invention relates to a decoding system of a low-density parity-check code, belonging to the field of communication technology. The decoding system of the low-density parity-check code comprises a plurality of decoding treatment devices, a first storage unit, a second storage unit, a decoding treatment device interleaving network and an interation stopping treatment device, wherein each decoding treatment device comprises a first alternative selector, an exclusive or arithmetic unit, a bit imformation arithmetic unit, a check node imformation arithmetic unit and an imformation node posterior probability likelihood ratio arithmetic unit, the check node imformation arithmetic unit comprises a buffer, a first comparator, a first register, a second alternative selector, a second register, a second comparator, a decoding post correcting device, a second cutoff arithmetic unit and a second complementary code converter, and the decoding post correcting device comprises n+1 comparison units, n subtraction units, a limiter and a zero setting device. By adding the decoding post correcting device, the invention remarkably lowers the bit error rate and the frame error rate, simplifies the interation stopping treatment device and saves the hardware resource consumption of the decoding system.

Description

Technical field [0001] The present invention relates to a decoding system in the field of communication technology, in particular to a decoding system of low-density check codes. Background technique [0002] Low Density Parity Check Codes (LDPC Codes) is a coding technology first proposed by Gallager in 1963. It has performance close to Shannon's limit and has become a hot spot in the coding field and has been widely used in various wireless applications. Standards in the communication field include my country's digital television ground transmission standard, European second-generation satellite digital video broadcasting standard, IEEE 802.11n, IEEE 802.16e, etc. In the current wireless communication, people pay more and more attention to high data rate communication. Therefore, an LDPC decoder with a simple structure, high throughput and excellent decoding performance is required. The structure of the LDPC code decoder has three forms: serial structure, full parallel structur...

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Problems solved by technology

However, compared with the belief propagation method, this technology has a large frame error rate, that is, a small number of bit decoding errors occur with a high probability for each frame of data under Gaussian noise, resulting in an excessively high decoding level; due to the iterative termination of module interleaving The structural characteristics of the network and the iteration termination processing device make the decoder consume more hardware resources

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