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Utilization of 2-D Markov source correlation using block turbo codes

Mohd. Izhar, Mohd. Azri and Fisal, Norsheila and Zhou, Xiaobo and Anwar, Khoirul and Matsumoto, Tad (2012) Utilization of 2-D Markov source correlation using block turbo codes. International Symposium on Turbo Codes and Iterative Information Processing, ISTC . pp. 56-60. ISSN 2165-4700

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Official URL: http://dx.doi.org/10.1109/ISTC.2012.6325198

Abstract

This paper proposes a joint source-channel coding technique using high rate block turbo codes where two-dimensional (2-D) source correlation of binary Markov source is well exploited. A modified Bahl-Cocke-Jelinek-Raviv (BCJR) algorithm is used in both horizontal and vertical decoders to exploit the 2-D source correlation. Based on extrinsic information transfer (EXIT) chart analysis and trajectory evaluation, we found out that the log-likelihood ratio (LLR) correlation for the block turbo codes increases as the source correlation becomes stronger and this prevents iterative decoding from convergence. A memory-1 accumulator with random interleaver is added to the design to minimise the LLR correlation and to achieve better performance when the source correlation is very strong. Further improvement can be achieved by replacing the memory-1 accumulator with a longer memory code to further reduce the statistical dependency of the LLR. It is shown that the proposed technique can achieve significant improvement over the standard system where the source correlation is not exploited

Item Type:Article
Uncontrolled Keywords:random interleaver, source correlation, standard system, statistical dependencies, data processing, iterative decoding
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:Electrical Engineering
ID Code:47703
Deposited By: Siti Nor Hashidah Zakaria
Deposited On:22 Jun 2015 05:56
Last Modified:21 Oct 2018 04:33

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