Change search
ReferencesLink to record
Permanent link

Direct link
Distributed Resource Allocation in Competitive Wireless Networks
KTH, School of Electrical Engineering (EES), Signal Processing.
2010 (English)Doctoral thesis, monograph (Other academic)
Abstract [en]

The recent advancements in wireless technology and the developmentof efficient spectrum sharing strategies have had a great impacton today's communication systems. It is not uncommon that severalnetworks are deployed in the same area, each serving multipleusers who expect ubiquitous access to various voice andinformation services. While traditional cellular network operatorsare centrally managed and license their part of the radiospectrum, some portions of the available bandwidth are being opento anyone. In these bands, several communication units tend tocoexist and create mutual interference to each other as there isno centralized control unit managing the resources. Suchinteraction can be modelled as an interference channel andefficient decentralized spectrum sharing strategies need to bedevised.

In this thesis, communication environments where two or morecommunication pairs coexist in the same spectrum are studied andtheir interaction is modelled as strategic non-cooperative games.Each pair operates as an independent unit and greedily allocatesits transmit power across the available spectrum such that theindividual link rate is maximized. We seek to achieve fixed-pointscorresponding to Nash equilibria (NE), where each user isunilaterally optimal. To attain such equilibria, a sequential orsimultaneous Iterative Water-Filling Algorithm (IWFA) is employedand its convergence properties are studied. Depending on thesystem parameters and the update strategy, different NE can beattained and some of these may result in poor overall spectrumutilization. The achievability of different NE is discussed forvarious system settings and the effect of initialization on theconvergence of IWFA is investigated. To improve the overall systemperformance in terms of sum rate, a class of modified utilityfunctions is introduced. In the long run, each link benefits fromsuch a utility since a more efficient spectrum usage results inbetter individual performance.

The methodology and concepts introduced in this thesis are usefulwhen designing and analyzing future decentralized spectrumallocation schemes. In particular, the effects of initializationshould be considered as well as the convergence behavior resultingfrom usage of different update strategies.

Place, publisher, year, edition, pages
Stockholm: KTH , 2010. , xiii, 121 p.
Trita-EE, ISSN 1653-5146 ; 050
National Category
Signal Processing
URN: urn:nbn:se:kth:diva-26161ISBN: 978-91-7415-789-5OAI: diva2:371077
Public defence
2010-12-14, Hörsal F3, Lindstedtsvägen 26, KTH, Stockholm, 13:15 (English)
QC 20101124Available from: 2010-11-24 Created: 2010-11-18 Last updated: 2010-11-24Bibliographically approved

Open Access in DiVA

No full text

Search in DiVA

By author/editor
von Wrycza, Peter
By organisation
Signal Processing
Signal Processing

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 223 hits
ReferencesLink to record
Permanent link

Direct link