An Iterative Joint Source-Channel (De-)Coding and (De-)Modulation Algorithm for G.729EV in Ultrashort Wave Communication

Tan PENG  Xiangming XU  Huijuan CUI  Kun TANG  Wei MIAO  

IEICE TRANSACTIONS on Information and Systems   Vol.E91-D   No.12   pp.2897-2901
Publication Date: 2008/12/01
Online ISSN: 1745-1361
DOI: 10.1093/ietisy/e91-d.12.2897
Print ISSN: 0916-8532
Type of Manuscript: LETTER
Category: Speech and Hearing
joint source-channel coding and modulation,  G.729EV,  speech coding,  soft decoding,  

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Improving the overall performance of reliable speech communication in ultrashort wave radios over very noisy channels is of great importance and practical use. An iterative joint source-channel (de-)coding and (de-)modulation (JSCCM) algorithm is proposed for ITU-T Rec.G.729EV by both exploiting the residual redundancy and passing soft information throughout the receiver while introducing a systematic global iteration process. Being fully compatible with existing transmitter structure, the proposed algorithm does not introduce additional bandwidth expansion and transmission delay. Simulations show substantial error correcting performance and synthesized speech quality improvement over conventional separate designed systems in delay and bandwidth constraint channels by using the JSCCM algorithm.