A multimode voice communications system with source-matched error protection for mobile communications

Author

Babich, Fulvio ; Vatta, Francesca

Author_Institution

Dipt. di Elettrotecnica Elettronica ed Inf., Trieste Univ., Italy

Volume

3

fYear

1997

fDate

4-7 May 1997

Firstpage

2007

Abstract

This paper presents the design of a source matched error protection code, tailoring the encoding operations to suit the different sensitivities of source bits to channel errors, in applications involving channels with time-varying error characteristics. The source coding algorithm selected for the qualitative analysis is a fast variable rate CELP coder (FVR-CELP), developed by CSELT S.p.A. in the UMTS Code Division Testbed (CODIT) project. We determine, on the basis of the quality degradation tolerated by each bit-group of the FVR-CELP coder, the unequal error protection needed by these bit-groups in different channel conditions. The FEC (forward error correction) protection chosen for the analysis are a set of source-sensitivity matched binary Bose-Chaudhury-Hocquenghem (BCH) codecs

Keywords

BCH codes; block codes; cellular radio; coding errors; error correction codes; error statistics; forward error correction; land mobile radio; linear predictive coding; radiowave propagation; source coding; speech codecs; speech coding; time-varying channels; voice communication; Bose-Chaudhury-Hocquenghem codecs; CODIT project; FVR-CELP coder; UMTS Code Division Testbed project; binary BCH codecs; block codes; channel conditions; channel errors; encoding operations; fast variable rate CELP coder; forward error correction; microcellular radio; mobile communications; multimode voice communications system; propagation model; quality degradation; source bits; source coding algorithm; source matched error protection code; time-varying channels; time-varying error characteristics; unequal error protection; 3G mobile communication; Algorithm design and analysis; Channel coding; Degradation; Error correction codes; Forward error correction; Mobile communication; Protection; Source coding; Speech analysis;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 1997, IEEE 47th

Conference_Location

Phoenix, AZ

ISSN

1090-3038

Print_ISBN

0-7803-3659-3

Type

conf

DOI

10.1109/VETEC.1997.605910

Filename

605910