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 prevalent 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 BERs 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.
1527-1545
Torrance, J.M.
45450484-6109-4120-ab06-9715ea9fb005
Hanzo, L.
66e7266f-3066-4fc0-8391-e000acce71a1
Keller, T.
41cd2bbf-bf82-4aac-83e9-d585f67f9742
September 1999
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), .
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 prevalent 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 BERs 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.
Text
48vt05-torrance.pdf
- Other
More information
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
Catalogue record
Date deposited: 10 Feb 2004
Last modified: 18 Mar 2024 02:32
Export record
Contributors
Author:
J.M. Torrance
Author:
L. Hanzo
Author:
T. Keller
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