A VR-CELP codec implementation for CDMA mobile communications

Author

Cellario, Luca ; Sereno, Daniele ; Giani, Mario ; Blöcher, Peter ; Hellwig, K.

Author_Institution

CSELT, Torino, Italy

fYear

1994

fDate

19-22 Apr 1994

Abstract

This paper focuses on the design, implementation and testing of a variable rate (VR) CELP codec aimed to be used in the testbed of one RACE-II project: CoDiT (code division testbed). The project has been conceived to demonstrate the potentiality of CDMA for the UMTS (universal mobile telecommunications system). Because of the flexibility permitted by CDMA to easily convey the information stream over a VR physical channel, the fixed-rate constraint has been removed from the speech coding algorithm design, in order to exploit the time-varying local character of speech. One major feature of the proposed algorithm is the possibility for the average rate to be either source-controlled or network-controlled. This is particularly appealing for cellular communications in order to cope with areas or cells with a high time-varying congestion

Keywords

cellular radio; code division multiple access; linear predictive coding; speech codecs; speech coding; variable rate codes; CDMA mobile communications; CoDiT; RACE-II project; UMTS; VR physical channel; VR-CELP codec implementation; cellular communications; code division testbed; design; fixed-rate constraint; network-controlled; source-controlled; speech coding algorithm design; testing; time-varying congestion; 3G mobile communication; Algorithm design and analysis; Codecs; Mobile communication; Multiaccess communication; Pattern classification; Proposals; Speech coding; Testing; Virtual reality;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech, and Signal Processing, 1994. ICASSP-94., 1994 IEEE International Conference on

Conference_Location

Adelaide, SA

ISSN

1520-6149

Print_ISBN

0-7803-1775-0

Type

conf

DOI

10.1109/ICASSP.1994.389300

Filename

389300