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Analysis and optimization of irregular LDPC codes for joint source-channel decoding
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DOI：10.1109/LCOMM.2005.1576589.png)
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摘要
En 中文
In this paper, we present a characterization, through its convergence analysis, and an optimisation of a joint source-channel receiver composed of a LDPC decoder and a Soft Input Soft Output (SISO) source decoder. Under Gaussian approximation, assuming the knowledge of the extrinsic mutual information transfer function (EXIT chart) of the source decoder, we derive the Mutual Information evolution equations, that semi-analytically describe the convergence of the iterative system behavior and, to complete the study, the stability condition at the convergence fixed point is derived for the joint receiver. From this analysis, a general optimisation method of the irregularity of the LDPC codes is proposed, which can be reduced to a linear programming optimisation problem. Simulation results show improved performance when compared to an AWGN optimized LDPC code.
Keyword:
LDPC codes
joint source and channel decoding (JSCD)
irregularity optimization
期刊
IF:
4.4
论文数:
1.3W
被引数:
2.2W
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