System evaluation of optimal downlink beamforming with congestion control in wireless communication
2006 (English)In: IEEE Transactions on Wireless Communications, ISSN 1536-1276, E-ISSN 1558-2248, Vol. 5, no 4, 743-751 p.Article in journal (Refereed) Published
We investigate the use of congestion control and joint optimal downlink beamforming, power control, and access point allocation, in a multi-cell wireless communication system. The access points of the system employ smart antennas and single antennas are used at the terminals. The possibility to send messages to multiple terminals at the same frequency in the same time slot is exploited. We show how previously proposed algorithms for optimal downlink beamforming easily can be extended to determine also the optimal access point for each mobile terminal. In order to assign resources, optimal beamforming requires a feasible set of mobiles, i.e. that all admitted users can be offered the required Signal-to-Interference-and-Noise Ratio. Therefore, an algorithm for deciding which mobile terminals to admit or reject from a congested system is proposed and evaluated. Using the proposed congestion algorithm, joint optimal downlink beamforming is evaluated and the throughput increase as compared to decentralized beamforming algorithms and other congestion control strategies is assessed from a system point of view. The results show that the proposed strategy can almost double the throughput compared to decentralized beamforming algorithms and give a fivefold increase in throughput compared to conventional beamforming without any interference suppression.
Place, publisher, year, edition, pages
IEEE Communications Society, 2006. Vol. 5, no 4, 743-751 p.
mobile communication, communication systems, antenna arrays, array signal processing, transmitting antennas, power control, resource management, optimization methods, power-control
IdentifiersURN: urn:nbn:se:kth:diva-15628DOI: 10.1109/TWC.2006.1618923ISI: 000236978000008ScopusID: 2-s2.0-33645817727OAI: oai:DiVA.org:kth-15628DiVA: diva2:333670
QC 201111092010-08-052010-08-052012-09-26Bibliographically approved