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Adaptive deactivation and zero-forcing scheme for low-complexity LDPC decoders

Authors
Kim, TaehyunBaik, JonghyunLee, MyeongwooHeo, Jun
Issue Date
11-9월-2017
Publisher
SPRINGEROPEN
Keywords
Low-density parity-check codes; Protograph-based extrinsic transfer chart; Normalized min-sum algorithm; Complexity reduction
Citation
EURASIP JOURNAL ON WIRELESS COMMUNICATIONS AND NETWORKING
Indexed
SCIE
SCOPUS
Journal Title
EURASIP JOURNAL ON WIRELESS COMMUNICATIONS AND NETWORKING
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/132186
DOI
10.1186/s13638-017-0934-z
ISSN
1687-1472
Abstract
A modified message propagation algorithm is proposed for a low-complexity decoder of low-density parity-check (LDPC) codes, which controls the information propagated from variable and check nodes. The proposed threshold-based node deactivation for variable nodes and zero-forcing scheme for check nodes remarkably reduce decoding complexity required for similar error performance. In the proposed scheme, different thresholds, which are determined from the base matrix of the LDPC codes, are applied for each type of variable node. In addition, thresholds for deactivating variable nodes are increased while the decoding process is operated for a reduction in decoding complexity without early error floor, which is a drawback of the conventional threshold-based deactivation scheme. Simulation results show that the proposed scheme enables normalized min-sum decoders to decode successfully with less complexity than the conventional threshold-based deactivating scheme.
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공과대학 (전기전자공학부)
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