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Is Transmit Beamforming Robust?
KTH, School of Electrical Engineering (EES), Signal Processing. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.
2011 (English)In: 2011 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS (ICC), New York: IEEE , 2011, 1-5 p.Conference paper (Refereed)
Abstract [en]

Transmit beamforming is a simple strategy that uses only one spatial direction in a multiple-input multiple-output (MIMO) channel. Due to its simplicity, beamforming is usually seen sensitive to inaccuracies of the channel state information at the transmitter (CSIT). In this paper, we investigate the robustness of beamforming with respect to the worst-case CSIT. Our result shows that beamforming is actually robust, in the sense that it achieves the maximum received signal-to-noise ratio (SNR) in the worst channel within an elliptical uncertainty region defined by the weighted spectral norm. This result implies that beamforming has the ability to combat against the imperfectness of CSIT, especially when channel dimensions or channel uncertainty are small.

Place, publisher, year, edition, pages
New York: IEEE , 2011. 1-5 p.
, IEEE International Conference on Communications, ISSN 1550-3607
Keyword [en]
Array signal processing, Convex functions, MIMO, Robustness, Signal to noise ratio, Uncertainty
National Category
URN: urn:nbn:se:kth:diva-55284DOI: 10.1109/icc.2011.5962759ISI: 000296057102005ScopusID: 2-s2.0-80052149104ISBN: 978-1-61284-233-2OAI: diva2:471174
IEEE International Conference on Communications (ICC) JUN 05-09, 2011 Kyoto, JAPAN
QC 20120102Available from: 2012-01-02 Created: 2012-01-02 Last updated: 2012-05-14Bibliographically approved

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Wang, Jiaheng
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Signal ProcessingACCESS Linnaeus Centre

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