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Quality of Service and Max-Min Fair Transmit Beamforming to Multiple Cochannel Multicast Groups
Technical University of Crete, Chania, Greece.
Technical University of Crete, Chania, Greece.
University of Minnesota, Minneapolis, USA.
2008 (English)In: IEEE Transactions on Signal Processing, ISSN 1053-587X, E-ISSN 1941-0476, Vol. 56, no 3, 1268-1279 p.Article in journal (Refereed) Published
Abstract [en]

The problem of transmit beamforming to multiple cochannel multicast groups is considered, when the channel state is known at the transmitter and from two viewpoints: minimizing total transmission power while guaranteeing a prescribed minimum signal-to-interference-plus-noise ratio (SINR) at each receiver; and a "fair" approach maximizing the overall minimum SINR under a total power budget. The core problem is a multicast generalization of the multiuser downlink beamforming problem; the difference is that each transmitted stream is directed to multiple receivers, each with its own channel. Such generalization is relevant and timely, e.g., in the context of the emerging WiMAX and UMTS-LTE wireless networks. The joint problem also contains single-group multicast beamforming as a special case. The latter (and therefore also the former) is NP-hard. This motivates the pursuit of computationally efficient quasi-optimal solutions. It is shown that Lagrangian relaxation coupled with suitable randomization/cochannel multicast power control yield computationally efficient high-quality approximate solutions. For a significant fraction of problem instances, the solutions generated this way are exactly optimal. Extensive numerical results using both simulated and measured wireless channels are presented to corroborate our main findings.

Place, publisher, year, edition, pages
2008. Vol. 56, no 3, 1268-1279 p.
Keyword [en]
Broadcasting, convex optimization, downlink beamforming, multicasting, semidefinite relaxation.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-66517DOI: 10.1109/TSP.2007.909010OAI: oai:DiVA.org:liu-66517DiVA: diva2:404883
Note
©2009 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. Eleftherios Karipidis, Nicholas Sidiropoulos and Zhi-Quan Luo, Quality of Service and Max-Min Fair Transmit Beamforming to Multiple Cochannel Multicast Groups, 2008, IEEE Transactions on Signal Processing, (56), 3, 1268-1279. http://dx.doi.org/10.1109/TSP.2007.909010 Available from: 2011-03-18 Created: 2011-03-18 Last updated: 2011-03-28

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