A Re-Configurable Speech Transceiver
A Re-Configurable Speech Transceiver
A 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 Bose-Chaudhuri-Hocquenghem (BCH) codecs combined with unequal-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 signaling rate of 3.1 kBd. In a bandwidth of 200 kHz 32 time slots can be created, which allows us to support i n 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.
1.5-1.6
Woodard, J.
89441930-8b87-4295-990c-b2d819a5f495
Hanzo, L.
66e7266f-3066-4fc0-8391-e000acce71a1
April 1995
Woodard, J.
89441930-8b87-4295-990c-b2d819a5f495
Hanzo, L.
66e7266f-3066-4fc0-8391-e000acce71a1
Woodard, J. and Hanzo, L.
(1995)
A Re-Configurable Speech Transceiver.
Proc. of 2nd International Workshop on Mobile Multimedia Communications, Bristol University, United Kingdom.
11 - 14 Apr 1995.
.
Record type:
Conference or Workshop Item
(Paper)
Abstract
A 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 Bose-Chaudhuri-Hocquenghem (BCH) codecs combined with unequal-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 signaling rate of 3.1 kBd. In a bandwidth of 200 kHz 32 time slots can be created, which allows us to support i n 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.
Text
jpw-lh-MoMuc-1995.pdf
- Other
More information
Published date: April 1995
Additional Information:
MoMuc-2 Event Dates: 11-14 April 1995 Address: Bristol, UK
Venue - Dates:
Proc. of 2nd International Workshop on Mobile Multimedia Communications, Bristol University, United Kingdom, 1995-04-11 - 1995-04-14
Organisations:
Southampton Wireless Group
Identifiers
Local EPrints ID: 251354
URI: http://eprints.soton.ac.uk/id/eprint/251354
PURE UUID: 7d667d80-b0dc-4443-b864-ef06d8559961
Catalogue record
Date deposited: 28 Oct 1999
Last modified: 18 Mar 2024 02:32
Export record
Contributors
Author:
J. Woodard
Author:
L. Hanzo
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