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Hybrid symbol- and bit-based source-controlled channel decoding for MELP speech parameters

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2 Author(s)
Liu, X. ; Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore ; Soo Ngee Koh

A joint source channel coding (JSCC) scheme which exploits bit-level correlation as well as symbol-level correlation efficiently in a source-controlled channel decoding (SCCD) process is proposed and applied to the mixed-excitation linear prediction (MELP) parameters of speech. A modified BCJR algorithm is also proposed for use in the SCCD algorithm. Simulation results show that our proposed scheme performs better than other redundancy-based JSCC schemes such as bit-based SCCD, soft-bit speech decoding (SBSD) and iterative source-channel decoding.

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Communications Letters, IEEE  (Volume:7 ,  Issue: 8 )