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Improved Gradient Descent Bit Flipping algorithms for LDPC decoding

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6 Author(s)
Phromsa-ard, T. ; Opt. & Quantum Commun. Lab. (OQC)., Nat. Electron. & Comput. Technol. Center, Pathumthani, Thailand ; Arpornsiripat, J. ; Wetcharungsri, J. ; Sangwongngam, P.
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For LDPC decoding, a class of weighted bit-flipping algorithms is much simpler than a belief propagation algorithm. This work proposes a modified Gradient Descent Bit-Flipping algorithm based on Reliability Ratio with an adaptive threshold to address trade-off between performance and latency. From numerical results, the proposed algorithm achieves lower latency without an expense of performance. It yields average iteration reduction of 15-27% over SNR range from 2.5 dB to 4.5 dB. In addition, it provides better decoding performance gains, i.e. 0.05-0.25 dB over low-to-medium SNR range between 1.5 dB and 4 dB comparing to previous schemes.

Published in:

Digital Information and Communication Technology and it's Applications (DICTAP), 2012 Second International Conference on

Date of Conference:

16-18 May 2012