Instanton analysis of Low-Density Parity-Check codes in the error-floor regime

M. Stepanov,M. Chertkov

Published 2006 in 2006 IEEE International Symposium on Information Theory

ABSTRACT

In this paper we develop instanton method introduced in V. Chernyak et al. (2004), M.G. Stepanov et al. (2005) to analyze quantitatively performance of low-density parity-check (LDPC) codes decoded iteratively in the so-called error-floor regime. We discuss statistical properties of the numerical instanton-amoeba scheme focusing on detailed analysis and comparison of two regular LDPC codes: Tanner's [155,64,20] and Margulis' [672,336,16] codes. In the regime of moderate values of the signal-to-noise ratio we critically compare results of the instanton-amoeba evaluations against the standard Monte Carlo calculations of the frame-error-rate

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