A second order approximation to reduce the complexity of LDPC decoders based on Gallager's approach

Authors: AYKUT KALAYCIOĞLU, OKTAY ÜRETEN, H. GÖKHAN İLK

Abstract: A piece-wise second order approximation to the f (x) = -log [tanh (x/2)] function is proposed to reduce the computational complexity of LDPC decoder's utilizing Log-Likelihood Ratio Belief Propagation (LLR-BP) algorithm based on Gallager's approach. Simulation results show that the proposed low complexity approximation doesn't cause BER performance degradation.

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