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Interference Aspects of Adaptive Modems over Slow Rayleigh Fading Channels

Interference Aspects of Adaptive Modems over Slow Rayleigh Fading Channels
Interference Aspects of Adaptive Modems over Slow Rayleigh Fading Channels
Adaptive modulation can achieve channel capacity gains by adapting the number of bits per transmission symbol on a burst-by-burst basis, in harmony with channel quality fluctuations. This is demonstrated in the paper for target bit error rates of 1 and 0.01%, respectively, in comparison to conventional fixed modems. However, the achievable gains depend strongly on the prevalant interference levels and hence interference cancellation is invoked on the basis of adjusting the demodulation decision boundaries after estimating the interfering channel’s magnitude and phase. Using the modem-mode switching levels of Table X and with the aid of interference cancellation, target BER’s of 1 and 0.01% can be maintained over slow-fading channels for a wide range of channel Signal-to-noise ratios (SNR) and Signal-to-interference ratios (SIR), as seen in Figs. 20 and 21, respectively. Index Terms—Burst-by-burst adaptive modulation (modems), cochannel interference, interference cancellation.
0018-9545
1527-1545
Torrance, J.M.
45450484-6109-4120-ab06-9715ea9fb005
Hanzo, L.
66e7266f-3066-4fc0-8391-e000acce71a1
Keller, T.
41cd2bbf-bf82-4aac-83e9-d585f67f9742
Torrance, J.M.
45450484-6109-4120-ab06-9715ea9fb005
Hanzo, L.
66e7266f-3066-4fc0-8391-e000acce71a1
Keller, T.
41cd2bbf-bf82-4aac-83e9-d585f67f9742

Torrance, J.M., Hanzo, L. and Keller, T. (1999) Interference Aspects of Adaptive Modems over Slow Rayleigh Fading Channels IEEE Transactions on Vehicular Technology, 48, (5), pp. 1527-1545.

Record type: Article

Abstract

Adaptive modulation can achieve channel capacity gains by adapting the number of bits per transmission symbol on a burst-by-burst basis, in harmony with channel quality fluctuations. This is demonstrated in the paper for target bit error rates of 1 and 0.01%, respectively, in comparison to conventional fixed modems. However, the achievable gains depend strongly on the prevalant interference levels and hence interference cancellation is invoked on the basis of adjusting the demodulation decision boundaries after estimating the interfering channel’s magnitude and phase. Using the modem-mode switching levels of Table X and with the aid of interference cancellation, target BER’s of 1 and 0.01% can be maintained over slow-fading channels for a wide range of channel Signal-to-noise ratios (SNR) and Signal-to-interference ratios (SIR), as seen in Figs. 20 and 21, respectively. Index Terms—Burst-by-burst adaptive modulation (modems), cochannel interference, interference cancellation.

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Published date: September 1999
Organisations: Southampton Wireless Group

Identifiers

Local EPrints ID: 251303
URI: http://eprints.soton.ac.uk/id/eprint/251303
ISSN: 0018-9545
PURE UUID: 635b188f-f676-4417-8ef2-22e5a0af0e91
ORCID for L. Hanzo: ORCID iD orcid.org/0000-0002-2636-5214

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Date deposited: 10 Feb 2004
Last modified: 18 Jul 2017 10:11

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Contributors

Author: J.M. Torrance
Author: L. Hanzo ORCID iD
Author: T. Keller

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