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Cooperative Beamforming for the MISO Interference Channel
Linköping University, Department of Electrical Engineering, Communication Systems. Linköping University, The Institute of Technology.
Linköping University, Department of Electrical Engineering, Communication Systems. Linköping University, The Institute of Technology.
2010 (English)In: Proceedings of the European Wireless Conference (EW), 2010, 631-638 p.Conference paper (Refereed)
Abstract [en]

A distributed beamforming algorithm is proposed for the two-user multiple-input single-output (MISO) interference channel (IFC). The algorithm is iterative and uses as bargaining value the interference that each transmitter generates towards the receiver of the other user. It enables cooperation among the transmitters in order to increase both users’ rates by lowering the overall interference. In every iteration, as long as both rates keep on increasing, the transmitters mutually decrease the generated interference. They choose their beamforming vectors distributively, solving the constrained optimization problem of maximizing the useful signal power for a given level of generated interference. The algorithm is equally applicable when the transmitters have either instantaneous or statistical channel state information (CSI). The difference is that the core optimization problem is solved in closed-form for instantaneous CSI, whereas for statistical CSI an efficient solution is found numerically via semidefinite programming. The outcome of the proposed algorithm is approximately Pareto-optimal. Extensive numerical illustrations are provided, comparing the proposed solution to the Nash equilibrium, zero-forcing, Nash bargaining, and maximum sum-rate operating points.

Place, publisher, year, edition, pages
2010. 631-638 p.
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-51796DOI: 10.1109/EW.2010.5483473ISBN: 978-1-4244-5999-5OAI: diva2:284102
16th European Wireless Conference, April 12-15, Lucca, Italy
©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: Johannes Lindblom and Eleftherios Karipidis, Cooperative Beamforming for the MISO Interference Channel, 2010, Proceedings of the 16th European Wireless Conference (EW'10). Available from: 2010-01-04 Created: 2009-11-18 Last updated: 2010-10-10
In thesis
1. Resource Allocation on the MISO Interference Channel
Open this publication in new window or tab >>Resource Allocation on the MISO Interference Channel
2010 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The need for wireless communications has increased during the last decades. To increase the data rates of the communication links there is a need of allocating larger frequency bands. These bands are strictly regulated and the majority of the frequencies are allocated to licensed systems. The splitting of the bandwidth is orthogonal, which mean that the different systems are not interfering each other. But, orthogonal splitting is inefficient since it does not exploit all degrees of freedom in the wireless channels.

There are also unlicensed bands where different systems co-exist and operate simultaneously in a non-orthogonal manner and interfere each other. This interference degrades the performance of each system. This motivates the use of so-called spectrum sharing techniques for interference management.

The spectrum sharing can be modeled via the so-called interference channel (IFC). This consists of at least two transmitter (TX)-receiver (RX) pairs. These pairs can share resources such as frequency, time, power, code, or space. Here, the focus is on the sharing of spatial resources. By employing multiple antennas at the TXs, spatial diversity is obtained and it is possible to steer the power in any spatial direction. Assuming a single antenna at each RX we get the so-called multiple-input single-output (MISO) IFC.

There is a conflict inherent in the IFC since the TX-RX pairs optimize conflicting objectives, e.g., the data rates. To analyze this conflict we use game-theoretic concepts. In general, the situation where the TXs transmit in the directions which are optimal for their objective is inefficient. That is, it is possible increase all rates of some (or all) TX-RX pairs without decreasing the rate of any of the pairs. To do so, the TXs change their strategies such that interference is decreased.

We define several rate regions, which depend on the channel model and channelstate information at the transmitters. Also, some of the most important game-theoretic operating points are described.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2010. 27 p.
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1438
National Category
Engineering and Technology
urn:nbn:se:liu:diva-55102 (URN)LIU-TEK-LIC-2010:9 (Local ID)978-91-7393-377-3 (ISBN)LIU-TEK-LIC-2010:9 (Archive number)LIU-TEK-LIC-2010:9 (OAI)
2010-05-28, Glashuset, B-huset, Campus Valla, Linköpings universitet, Linköping, 13:15 (English)
Available from: 2010-05-03 Created: 2010-04-29 Last updated: 2016-08-31Bibliographically approved

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