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A Dual-rate Algebraic CELP-based Speech Transceiver

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.

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Citation

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.

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

Identifiers

Local EPrints ID: 257161
URI: http://eprints.soton.ac.uk/id/eprint/257161
PURE UUID: 44164d37-1e47-471d-8873-53dcc07f8483

Catalogue record

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

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Contributors

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

University divisions


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