Laminated and partitioned irregular low density parity check (LDPC) code decoder and decoding method

Abstract

The invention discloses a laminated and partitioned irregular low density parity check (LDPC) code decoder and a decoding method in the technical field of communication. An external information storage unit outputs a soft value transmitted to an information node by a last iterated check node to a decoding processing module. A cyclic shift register transmits a posterior probability likelihood ratio update value of the information node to the decoding processing module. The decoding processing module transmits the check update value in the iteration to the external information storage unit, andsimultaneously transmits the posterior probability likelihood ratio update value of the information node to the cyclic shift register through a decoding processing module interweaving network. The decoder is suitable for decoding all quality control (QC) LDPC codes, and all the partitioned LDPC code words support decoding; the decoder has no stream competition conflict, and has better throughput performance and relatively simple working time sequence; and the consumption of the interweaving network of huge resources is not needed, many hardware resources are saved, and the resource consumption of the whole decoder is relatively low. The decoding supporting parallelism degree can be flexibly changed.

Description

technical field [0001] The invention relates to a decoder and a decoding method in the field of communication technology, in particular to a layered block irregular low-density check code decoder and a decoding method. 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 the Shannon limit. It has become a research hotspot in the field of coding and is widely used in various Standards in the field of wireless communication include my country's digital TV terrestrial transmission standard, the European second-generation satellite digital video broadcasting standard, IEEE802.11n, IEEE802.16e, etc. In the current wireless communication, people pay more and more attention to the communication of high data rate, so the LDPC decoder with simple structure and high throughput has always been the research focus of LDPC codes. In addition, in practical applications, codes with di...

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Problems solved by technology

[0004] Aiming at the deficiencies in the prior art, the present invention proposes a layered block non-regular low-density check code decoder and a decoding method, and the improved decoding The device structure does not require an interleaving network, which saves hardware resource consumption, has very small resource consumption, does not have the problem of pipeline conflict, has good throughput performance, and can support QC-LDPC codes with a large expansion factor and all QC-LDPC codes. LDPC code decoding supports decoding with multiple expansion factors, which complements the deficiencies of the first two decoders

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