Title :
Improved channel coding and estimation for adaptive multirate (AMR) speech transmission
Author :
Hindelang, Thomas ; Kaindl, Markus ; Hagenauer, Joachim ; Schmautz, Max ; Xu, Wen
Author_Institution :
Inst. for Commun. Eng., Munich Univ. of Technol., Munich, Germany
Abstract :
A variable channel coding scheme for adaptive multirate (AMR) speech transmission over mobile radio channels is proposed. Although it was developed for the GSM, the basic concept of variable channel coding can be adopted to other digital radio systems like UMTS. The AMR concept allows almost wire-line speech quality even for poor channel conditions by dynamically splitting the gross bit rate between source (speech) and channel coding according to the channel quality
Keywords :
adaptive codes; cellular radio; channel coding; convolutional codes; digital radio; forward error correction; parameter estimation; speech coding; speech intelligibility; telecommunication channels; variable rate codes; voice communication; AMR concept; FEC; GSM; UMTS; adaptive multirate speech transmission; channel coding; channel estimation; channel quality; digital radio systems; forward error correction; gross bit rate; in-band transmission; mobile radio channels; poor channel conditions; recursive systematic convolutional codes; source coding; variable channel coding; wire-line speech quality; Bit rate; Channel coding; Digital communication; GSM; Mobile communication; Protection; Redundancy; Speech codecs; Speech coding; Telecommunication standards;
Conference_Titel :
Vehicular Technology Conference Proceedings, 2000. VTC 2000-Spring Tokyo. 2000 IEEE 51st
Conference_Location :
Tokyo
Print_ISBN :
0-7803-5718-3
DOI :
10.1109/VETECS.2000.851317
