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IMPROVING BER PERFORMANCE OF LDPC CODES BASED ON INTERMEDIATE DECODING RESULTS

Alghonaim, Esa and Andalusi, Adnan and El-Maleh, Aiman H. (2007) IMPROVING BER PERFORMANCE OF LDPC CODES BASED ON INTERMEDIATE DECODING RESULTS. IEEE International Conference on Signal Processing and Communications. pp. 1547-1550.

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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 random-like, 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:Article
Date:November 2007
Date Type:Publication
Subjects:Computer
Electrical
Divisions:College Of Computer Sciences and Engineering > Computer Engineering Dept
Creators:Alghonaim, Esa and Andalusi, Adnan and El-Maleh, Aiman H.
Email:esa.alg@gmail.com, andalusi@kfupm.edu.sa, aimane@kfupm.edu.sa
ID Code:161
Deposited By:AIMAN HELMI EL-MALEH
Deposited On:29 Feb 2008 23:21
Last Modified:12 Apr 2011 13:05

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