A Dual-rate Algebraic CELP-based Speech Transceiver
A Dual-rate Algebraic CELP-based Speech Transceiver
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.
1690-1694
Woodard, J.P.
554fe4b7-5fc5-486b-bd6f-5ec6f93b0067
Hanzo, L.
66e7266f-3066-4fc0-8391-e000acce71a1
June 1994
Woodard, J.P.
554fe4b7-5fc5-486b-bd6f-5ec6f93b0067
Hanzo, L.
66e7266f-3066-4fc0-8391-e000acce71a1
Woodard, J.P. and Hanzo, L.
(1994)
A Dual-rate Algebraic CELP-based Speech Transceiver.
of VTC'94, Stockholm,, Sweden.
07 - 11 Jun 1994.
.
Record type:
Conference or Workshop Item
(Other)
Abstract
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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jpw-lh-vtc-1994.pdf
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More information
Published date: June 1994
Additional Information:
Event Dates: 7-11 June 1994 Address: Stockholm , Sweeden
Venue - Dates:
of VTC'94, Stockholm,, 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
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Date deposited: 16 Jan 2003
Last modified: 18 Mar 2024 02:33
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Contributors
Author:
J.P. Woodard
Author:
L. Hanzo
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