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A Re-Configurable Speech Transceiver

Woodard, J. and Hanzo, L. (1995) A Re-Configurable Speech Transceiver At Proc. of 2nd International Workshop on Mobile Multimedia Communications, United Kingdom. 11 - 14 Apr 1995. , 1.5-1.6.

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. Sourcematched Bose-Chaudhuri-Hocquenghem (BCH) codecs combined with un-equal ,protection diversityand pilot-assisted 16- and 64level 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 multipleaccess (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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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, 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 Jul 2017 10:10

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Contributors

Author: J. Woodard
Author: L. Hanzo

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