We introduce the use of Fast Flat Histogram (FFH) method employing Wang Landau Algorithm in an adaptive noise sampling framework using Random Walk to find out the pseudo-codewords and consequently the pseudo-weights for the Belief Propagation (BP) decoding of LDPC codes over an Additive White Gaussian Noise (AWGN) channel The FFH method enables us to tease out pseudo-codewords at very high Signal-to-Noise Ratios (SNRs) exploring the error floor region of a wide range of codes varying in length and structure. We present the pseudo-weight (effective distance) spectra for these codes and analyze their respective behavior.
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