The University of Southampton
University of Southampton Institutional Repository

A Dual-rate Algebraic CELP-based Speech Transceiver

Woodard, J.P. and Hanzo, L. (1994) A Dual-rate Algebraic CELP-based Speech Transceiver At of VTC'94, Sweden. 07 - 11 Jun 1994. , pp. 1690-1694.

Record type: Conference or Workshop Item (Other)


A novel high-quality, low-complexity dual-rate 4.7/6.5 kbits/s algebraic code excited linear predictive (ACELP) codec is proposed for adaptive speech communicators, which can drop their source rate and speech quality under network control in order to invoke a more error resilient modem amongst less favourable channel conditions. Source-matched binary Bose-Chaudhuri-Hocquenghem (BCH) codecs combined with un-equal protection diversity- and pilot-assisted 16- and 64-level quadrature amplitude modulation (16-QAM, 64-QAM) are employed in order to accommodate both the 4.7 and the 6.5 kbits/s coded speech bits at a signalling rate of 3.1 KBd. In a bandwidth of 200 KHz 32 time slots can be created, which allows us to support in excess of 50 users, when employing packet reservation multiple access (PRMA). Good communications quality speech is delivered in an equivalent bandwidth of 4 kHz, if the channel signal-to-noise ratio (SNR) and signal-to-interference ratio (SIR) are in excess of about 15 and 25 dB for the lower and higher speech quality 16-QAM and 64-QAM systems, respectively.

PDF jpw-lh-vtc-1994.pdf - Other
Download (393kB)

More information

Published date: June 1994
Additional Information: Event Dates: 7-11 June 1994 Address: Stockholm , Sweeden
Venue - Dates: of VTC'94, Sweden, 1994-06-07 - 1994-06-11
Organisations: Southampton Wireless Group


Local EPrints ID: 257161
PURE UUID: 44164d37-1e47-471d-8873-53dcc07f8483

Catalogue record

Date deposited: 16 Jan 2003
Last modified: 18 Jul 2017 09:40

Export record


Author: J.P. Woodard
Author: L. Hanzo

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton:

ePrints Soton supports OAI 2.0 with a base URL of

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.