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In this paper a scheme for joint source-channel coding based on LDPC codes is investigated. Two concatenated independent LDPC codes are used in the transmitter: one for source and the other for channel coding, with joint belief propagation decoder. The asymptotic behavior is analyzed using EXtrinsic Information Transfer (EXIT) charts and this approximation is corroborated with illustrative experiments. The optimization of the degree distributions for the authors' sparse code to maximize the information transmission rate is also considered.
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