2013•Bandaoti guangdianRequires access

Study on Decoding Algorithm for LDPC Codes under AWGN Channel

Yong Wang

Abstract

Under the condition of the Additive White Gaussian Noise(AWGN) channel,both the hard and soft decision decoding algorithms suitable for LDPC codes are simulated and comparatively analyzed based on analyzing the decoding algorithm for LDPC codes.The variable message correlation for Log-Likelihood-Ratio Belief-Propagation(LLR-BP) algorithm in soft decision algorithm is decreased by introducing a multiplicative correction factor.The simulation results show that the decoding error-correction performance of the modified LLR-BP algorithm is greatly improved with little increase of computing complexity.

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Key concepts: Low-density parity-check code, Additive white Gaussian noise, Algorithm, Decoding methods, Berlekamp–Welch algorithm, Belief propagation, Channel (broadcasting), Sequential decoding