Realtime robust speech communication based on iterative joint source-channel decoding and demodulation algorithm for MELP vocoder  

作　　者：彭坦 Cui Huijuan Tang Kun 

机构地区：[1]Tsinghua National Laboratory for Information Science and Technology, State Key laboratory on Microwave and Digital Communications, Department of Electronic Engineering, Tsinghua University, Beijing 100084, P.R. China

出　　处：《High Technology Letters》2010年第2期111-116,共6页高技术通讯（英文版）

基　　金：Supported by the National Natural Science Foundation of China （No. 60572081 ）

摘　　要：Realtime speech communications require high efficient compression algorithms to encode speech signals. As the compressed speech parameters are highly sensitive to transmission errors, robust source and channel decoding and demodulation schemes are both important and of practical use. In this paper, an it- erative joint souree-channel decoding and demodulation algorithm is proposed for mixed excited linear pre- diction （MELP） vocoder by both exploiting the residual redundancy and passing soft information through- out the receiver while introducing systematic global iteration process to further enhance the performance. Being fully compatible with existing transmitter structure, the proposed algorithm does not introduce addi- tional bandwidth expansion and transmission delay. Simulations show substantial error correcting perfor- mance and synthesized speech quality improvement over conventional separate designed systems in delay and bandwidth constraint channels by using the joint source-channel decoding and demodulation （JSCCM） algorithm.

关 键 词：speech coding joint souree-channel coding and modulation （JSCCM） iterative decoding 

分 类 号：TN912.3[电子电信—通信与信息系统] TN924[电子电信—信息与通信工程]