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Improving BER Performance of LDPC Codes based on Intermediate Decoding Results

A-Ghoneim, E. and Landolsi, M.A. and El-Maleh, A.H. Improving BER Performance of LDPC Codes based on Intermediate Decoding Results. In: IEEE ICSPC, Dec. 2007.

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Abstract

The paper presents a novel approach to reduce the bit error rate (BER) in iterative belief propagation (BP) decoding of low density parity check (LDPC) codes. The behavior of the BP algorithm is first investigated as a function of number of decoder iterations, and it is shown that typical uncorrected error patterns can be classified into 3 categories: oscillating, nearly-constant, or randomlike, with a predominance of oscillating patterns at high Signal-to-Noise (SNR) values. A proposed decoder modification is then introduced based on tracking the number of failed parity check equations in the intermediate decoding iterations, rather than relying on the final decoder output (after reaching the maximum number of iterations). Simulation results with a rate ½ (1024,512) progressive edge-growth (PEG) LDPC code show that the proposed modification can decrease the BER by as much as 10-to-40%, particularly for high SNR values.



Item Type:Conference or Workshop Item (Paper)
Subjects:Electrical
Divisions:College Of Engineering Sciences > Electrical Engineering Dept
Creators:A-Ghoneim, E. and Landolsi, M.A. and El-Maleh, A.H.
ID Code:997
Deposited By:MOHAMMAD NURUZZAMAN
Deposited On:11 Jun 2008 11:31
Last Modified:12 Apr 2011 13:07

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