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Uniformly most powerful Belief propagation decoding of LDPC

Keywords:

I.А. Kirianov – Engineer, GSKB Almaz-Antey (Moscow). E-mail: cucutnog@bk.ru


The purpose of this article was to analyze the variants decoding low-density parity-check codes. Basic algorithms for decoding are complex. Suboptimal algorithms are used in practice. This allows reducing the complexity and increasing the processing speed. Uniformly most powerful Belief propagation (UMP BP) algorithm is a simplified algorithm. Correcting ability of this algorithm is less than correcting ability of basic algorithm. Modified calculation of check nodes can improve the ability of correcting. The main idea of this modification is to change the threshold from iteration to iteration. UMP BP has invariable threshold. It makes errors in the initial iterations. Threshold with varying for the initial iterations allows neutralize this errors. In this paper we propose a method of threshold varying and investigate the influence of the threshold on the decoding performance.
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