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Maximizing the Sum Rate in Symmetric Networks of Interfering Links

We consider the power optimization problem of maximizing the sum rate of a symmetric network of interfering links in Gaussian noise. All transmitters have an average transmit power constraint, the same for all transmitters. We solve this nonconvex problem by indentifying some underlying convex struc...

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Main Authors: Bhaskaran, S.R., Hanly, Stephen, Badruddin , Nasreen, Evans, Jamie
Format: Conference or Workshop Item
Published: 2009
Subjects:
TK Electrical engineering. Electronics Nuclear engineering
Online Access:http://ieeexplore.ieee.org/search/srchabstract.jsp?tp=&arnumber=5199170
http://eprints.utp.edu.my/4425/
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spelling my.utp.eprints.44252011-03-18T01:49:18Z Maximizing the Sum Rate in Symmetric Networks of Interfering Links Bhaskaran, S.R. Hanly, Stephen Badruddin , Nasreen Evans, Jamie TK Electrical engineering. Electronics Nuclear engineering We consider the power optimization problem of maximizing the sum rate of a symmetric network of interfering links in Gaussian noise. All transmitters have an average transmit power constraint, the same for all transmitters. We solve this nonconvex problem by indentifying some underlying convex structure. In particular, we characterize the maximum sum rate of the network, and show that there are essentially two possible states at the optimal solution depending on the cross-gain (radicisin) between the links, and/or the average power constraint: the first is a wideband (WB) state , in which all links interfere with each other, and the second is a frequency division multiplexing (FDM) state, in which all links operate in orthogonal frequency bands. The FDM state is optimal if the cross-gain between the links is above 1/radic2. If isin < 1/2, then FDM is still optimal provided the average power of the links is sufficiently high. With e < 1/2, the WB state occurs when the average power level is low (relative to the noise and the cross-gain factor), but as we increase the average power level from low to high, there is a smooth transition from the WB state to the FDM state: For intermediate average power levels, the optimal configuration is a mixture, with some fraction of the bandwidth in the WB state, and the other fraction in the FDM state. This work has applications to DSL, as well as to wireless networks. 2009-06-14 Conference or Workshop Item PeerReviewed http://ieeexplore.ieee.org/search/srchabstract.jsp?tp=&arnumber=5199170 Bhaskaran, S.R. and Hanly, Stephen and Badruddin , Nasreen and Evans, Jamie (2009) Maximizing the Sum Rate in Symmetric Networks of Interfering Links. In: IEEE International Conference on Communications, 2009. ICC '09. , 14 - 18 Sept 2009, Dresden, Germany. http://eprints.utp.edu.my/4425/
institution Universiti Teknologi Petronas
building UTP Resource Centre
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Petronas
content_source UTP Institutional Repository
url_provider http://eprints.utp.edu.my/
topic TK Electrical engineering. Electronics Nuclear engineering
spellingShingle TK Electrical engineering. Electronics Nuclear engineering
Bhaskaran, S.R.
Hanly, Stephen
Badruddin , Nasreen
Evans, Jamie
Maximizing the Sum Rate in Symmetric Networks of Interfering Links
description We consider the power optimization problem of maximizing the sum rate of a symmetric network of interfering links in Gaussian noise. All transmitters have an average transmit power constraint, the same for all transmitters. We solve this nonconvex problem by indentifying some underlying convex structure. In particular, we characterize the maximum sum rate of the network, and show that there are essentially two possible states at the optimal solution depending on the cross-gain (radicisin) between the links, and/or the average power constraint: the first is a wideband (WB) state , in which all links interfere with each other, and the second is a frequency division multiplexing (FDM) state, in which all links operate in orthogonal frequency bands. The FDM state is optimal if the cross-gain between the links is above 1/radic2. If isin < 1/2, then FDM is still optimal provided the average power of the links is sufficiently high. With e < 1/2, the WB state occurs when the average power level is low (relative to the noise and the cross-gain factor), but as we increase the average power level from low to high, there is a smooth transition from the WB state to the FDM state: For intermediate average power levels, the optimal configuration is a mixture, with some fraction of the bandwidth in the WB state, and the other fraction in the FDM state. This work has applications to DSL, as well as to wireless networks.
format Conference or Workshop Item
author Bhaskaran, S.R.
Hanly, Stephen
Badruddin , Nasreen
Evans, Jamie
author_facet Bhaskaran, S.R.
Hanly, Stephen
Badruddin , Nasreen
Evans, Jamie
author_sort Bhaskaran, S.R.
title Maximizing the Sum Rate in Symmetric Networks of Interfering Links
title_short Maximizing the Sum Rate in Symmetric Networks of Interfering Links
title_full Maximizing the Sum Rate in Symmetric Networks of Interfering Links
title_fullStr Maximizing the Sum Rate in Symmetric Networks of Interfering Links
title_full_unstemmed Maximizing the Sum Rate in Symmetric Networks of Interfering Links
title_sort maximizing the sum rate in symmetric networks of interfering links
publishDate 2009
url http://ieeexplore.ieee.org/search/srchabstract.jsp?tp=&arnumber=5199170
http://eprints.utp.edu.my/4425/
_version_ 1738655339380736000
score 13.211869

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