[1]周琳,吴镇扬.基于MTD模型的联合GSM语音解码算法[J].东南大学学报(自然科学版),2004,34(5):570-573.[doi:10.3969/j.issn.1001-0505.2004.05.002]
 Zhou Lin,Wu Zhenyang.Joint GSM speech decoding algorithm based on MTD model[J].Journal of Southeast University (Natural Science Edition),2004,34(5):570-573.[doi:10.3969/j.issn.1001-0505.2004.05.002]
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基于MTD模型的联合GSM语音解码算法()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
34
期数:
2004年第5期
页码:
570-573
栏目:
信息与通信工程
出版日期:
2004-09-20

文章信息/Info

Title:
Joint GSM speech decoding algorithm based on MTD model
作者:
周琳 吴镇扬
东南大学无线电工程系, 南京 210096
Author(s):
Zhou Lin Wu Zhenyang
Department of Radio Engineering, Southeast University, Nanjing 210096, China
关键词:
MTD MAP/MS/延迟MS准则 联合信道信源解码
Keywords:
MTD MAP/MS delay-MS criterion joint channel-source decoding
分类号:
TN911.22
DOI:
10.3969/j.issn.1001-0505.2004.05.002
摘要:
利用GSM EFR语音编码参数的时间相关性,提出了基于参数估计的信道、信源联合解码算法.该算法首先采用MTD模型对信源参数进行高阶马尔可夫建模,然后将MTD模型参数作为解码端的先验信息,同时利用信道或信道解码提供的接收数据似然值,计算发送参数的后验概率,进行基于MAP,MS或延迟MS准则的参数估计.仿真结果表明,对于GSM EFR语音传输系统,本文提出的联合解码算法性能明显优于信道、信源独立解码算法,提高了参数和语音的全局信噪比,有效改善了系统性能.
Abstract:
Joint source channel decoding algorithm based on parameter estimation with the time correlation of GSM(global system for mobile communication)EFR(enhanced full rate)encoded parameter is proposed. This algorithm utilizes MTD(mixture transition distribution)model to approximate high order Markov chain of parameter. Combined MTD model with likelihood value of received parameter provided by channel decoder, parameter is estimated according to MAP(maximum a posterior)/MS(minimum mean square)/delay-MS criterion. Simulation result shows that, for GSM EFR system, this method greatly improves the global SNR(signal to noise ratio)of parameter and speech compared with separate source channel decoding.

参考文献/References:

[1] Favardin N,Vaishanpayan V.Optimal quantizer design for noisy channels:an approach to combined source-channel coding [J]. IEEE Trans on Inform Theory, 1987,33(6):827-838.
[2] Favardin N.A study of vector quantization for noisy channel [J]. IEEE Trans on Inform Theory,1990,36(4):799-809.
[3] Zhu Guangchong.Joint source-channel coding via turbo codes [D].Ontario,Canada:Department of Mathematics and Statistics,Queen’s University,2003.
[4] Fingscheidt T,Hindelang T,Cox R V,et al.Joint source-channel(de-)coding for mobile communications [J]. IEEE Transaction on Communication,2002,50(2):200-211.
[5] Hochwald B,Zeger K.Tradeoff between source and channel coding [J]. IEEE Transaction on Information Theory, 1997,43(5):1412-1424.
[6] Cox R V,Kleijn W B,Kroon P.Robust CELP coders for noisy backgrounds and noisy channels [A].In:Proceedings of ICASSP-89[C].Glascow,Scotland,1989,2:739-742.
[7] Kroon P,Atal B S.Strategies for improving the performance of CELP coders at low bit rates [A].In: Proceedings of ICASSP-88[C].New York,USA,1988,1:151-154.
[8] Berchtold A. Estimation of the mixture transition distribution model [R].Seattle,WA:Department of Statistics,University of Washington,1999.
[9] Berchtold A.Software GMTD [EB/OL].http://www.andreberchtold.com/softwares.html,1999-04/2000-04-28.

备注/Memo

备注/Memo:
作者简介: 周琳(1978—),女,博士生; 吴镇扬(联系人),男,教授,博士生导师,zhenyang@seu.edu.cn.
更新日期/Last Update: 2004-09-20