An Improved Decoding Algorithm for Finite-Geometry LDPC Codes

Yueguang BIAN  Youzheng WANG  Jing WANG  

IEICE TRANSACTIONS on Communications   Vol.E90-B   No.4   pp.978-981
Publication Date: 2007/04/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e90-b.4.978
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Fundamental Theories for Communications
belief propagation (BP),  feedback BP (FBP),  low-density parity-check (LDPC) codes,  iterative decoding,  finite-geometry LDPC,  

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In this letter, we propose a new modification to the belief propagation (BP) decoding algorithm for Finite-Geometry low-density parity-check (LDPC) codes. The modification is based on introducing feedback into the iterative process, which can break the oscillations of bit log-likelihood ratio (LLR) values. Simulations show that, with a given maximum iteration, the "feedback BP" (FBP) algorithm can achieve better performance than the conventional belief propagation algorithm.