An intelligent multimode voice communications system for indoor communications
An intelligent multimode voice communications system for indoor communications
A novel high-quality, low-complexity dual-rate 4.7 and 6.5 kbits/s algebraic code excited linear predictive codec is proposed for adaptive multi-mode 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 favorable channel conditions. Source-matched binary 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. Assuming an excess bandwidth of 100%, in a bandwidth of 200 kHz 32 time slots can he 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) of the benign indoors cordless channel are in excess of about 15 and 25 dB for the lower and higher speech quality 16-QAM and 64-QAM systems, respectively, and the PRMA time-slots are sufficiently uninterfered due to using time-slot classification algorithms and due to the attenuation of partitioning walls and ceilings.
735-748
Hanzo, L.
66e7266f-3066-4fc0-8391-e000acce71a1
Woodard, J.P.
f1296f1b-304c-4165-a4d4-828e85a59857
November 1995
Hanzo, L.
66e7266f-3066-4fc0-8391-e000acce71a1
Woodard, J.P.
f1296f1b-304c-4165-a4d4-828e85a59857
Hanzo, L. and Woodard, J.P.
(1995)
An intelligent multimode voice communications system for indoor communications.
IEEE Transactions on Vehicular Technology, 44 (4), .
(doi:10.1109/25.467957).
Abstract
A novel high-quality, low-complexity dual-rate 4.7 and 6.5 kbits/s algebraic code excited linear predictive codec is proposed for adaptive multi-mode 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 favorable channel conditions. Source-matched binary 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. Assuming an excess bandwidth of 100%, in a bandwidth of 200 kHz 32 time slots can he 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) of the benign indoors cordless channel are in excess of about 15 and 25 dB for the lower and higher speech quality 16-QAM and 64-QAM systems, respectively, and the PRMA time-slots are sufficiently uninterfered due to using time-slot classification algorithms and due to the attenuation of partitioning walls and ceilings.
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Published date: November 1995
Organisations:
Southampton Wireless Group
Identifiers
Local EPrints ID: 251358
URI: http://eprints.soton.ac.uk/id/eprint/251358
ISSN: 0018-9545
PURE UUID: d0c3ba95-a189-4a23-8f60-e103ecdd2a3c
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Date deposited: 03 Apr 2001
Last modified: 18 Mar 2024 02:32
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Author:
L. Hanzo
Author:
J.P. Woodard
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