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Lowering Error Floor of LDPC Codes Using an Improved Parallel WBF Algorithm
Kexiang Ma,Yongzhao Li,Caizhi Zhu,Hailin Zhang,Yuming Zhang 한국전자통신연구원 2014 ETRI Journal Vol.36 No.1
In weighted bit-flipping-based algorithms for low-densityparity-check (LDPC) codes, due to the existence ofoverconfident incorrectly received bits, the metric values of thecorresponding bits will always be wrong in the decodingprocess. Since these bits cannot be flipped, decoding failureresults. To solve this problem, an improved parallel weightedbit flipping algorithm is proposed. Specifically, a reliabilitysaturationstrategy is adopted to increase the flippingprobability of the overconfident incorrectly received bits. Simulation results show that the error floor of LDPC codes isgreatly lowered.