Extending DECT range through speech coding control

Author

Torres-Guijarro, S. ; Sanchez-Perez, R. ; CasajÙs-Quirós, F. Javier

Author_Institution

ETSI Telecommun., Valladolid, Spain

Volume

3

fYear

1998

fDate

18-21 May 1998

Firstpage

2449

Abstract

In this contribution, variable rate coding techniques are proposed to improve the speech quality of the DECT system in poor channel conditions. The basic idea is to estimate in advance the quality of the channel, and subsequently select the best source-channel rate combination. The channel quality is predicted from the characteristics of the signal received in previous frames. The introduction of G.727 variable rate embedded speech coder, combined with FEC codes provides the rate adaptation. Objective quality measurements demonstrate the possibilities of this approach

Keywords

code standards; combined source-channel coding; cordless telephone systems; error correction codes; forward error correction; indoor radio; speech coding; telecommunication channels; variable rate codes; FEC codes; G.727 variable rate embedded speech coder; channel quality; extending DECT range; poor channel conditions; rate adaptation; signal characteristics; source-channel rate combination; speech coding control; speech quality; variable rate coding techniques; Bit error rate; Decoding; Demodulation; Forward error correction; Propagation losses; Pulse modulation; Speech coding; Switches; Telecommunication control; Telecommunication standards;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 1998. VTC 98. 48th IEEE

Conference_Location

Ottawa, Ont.

ISSN

1090-3038

Print_ISBN

0-7803-4320-4

Type

conf

DOI

10.1109/VETEC.1998.686199

Filename

686199