Second-order power control with asymptotically fast convergence

This paper proposes a distributed power control algorithm that uses power levels of both current and previous iterations for power update. The algorithm is developed by applying the successive overrelaxation method to the power control problem. The gain from such a second-order algorithm is in faste...

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Bibliographic Details
Published in:IEEE journal on selected areas in communications 2000-03, Vol.18 (3), p.447-457
Main Authors: Jantti, R., Seong-Lyun Kim
Format: Article
Language:English
Subjects:
Active control
Algorithm design and analysis
Algorithms
Associate members
Asymptotic properties
cellular radio system
Control algorithms
Convergence
Distributed computing
Gain
Information technology
Informationsteknik
Land mobile radio cellular systems
Multiaccess communication
Networks
Optimization
Power control
Radio network
Radio transmitters
SRA - ICT
SRA - Informations- och kommunikationsteknik
Studies
successive overrelaxation
TECHNOLOGY
TEKNIKVETENSKAP
Telecommunication traffic
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Summary:This paper proposes a distributed power control algorithm that uses power levels of both current and previous iterations for power update. The algorithm is developed by applying the successive overrelaxation method to the power control problem. The gain from such a second-order algorithm is in faster convergence. Convergence analysis of the algorithm in case of feasible systems is provided in this paper. Using the distributed constrained power control (DCPC) as a reference algorithm, we carried out computational experiments on a DS-CDMA system. The results indicate that our algorithm significantly enhances the convergence speed of power control. A practical version of the proposed algorithm is provided and compared with the bang-bang type algorithm used in the IS-95 and the WCDMA systems. The results show that our algorithm also has a high potential for increasing the radio network capacity. Our analysis assumes that the system is feasible in the sense that we can support every active user by an optimal power control. When the system becomes infeasible because of high traffic load, it calls for other actions such as transmitter removal, which is beyond the scope of the present paper.
ISSN:0733-8716
1558-0008
1558-0008
DOI:10.1109/49.840203