NDLI: Robust downlink beamforming with imperfect CSI

Content Provider	IEEE Xplore Digital Library
Author	Tshangini, M. Nakhai, M.R.
Copyright Year	2013
Description	Author affiliation: Inst. of Telecommun., King's Coll. London, London, UK (Tshangini, M.; Nakhai, M.R.)
Abstract	In this paper, we consider an optimum multicell downlink beamforming that minimizes a combination of the sum-power, used by each base station (BS) to transmit data to its local users, and the worst-case of the resulting overall interference induced on the other users of the adjacent cells in the presence of imperfect channel state information (CSI). The aim is to ensure that the worst-cases of the signal-to-interference-plus-noise ratio (SINR) at each user remains above the required level. The imperfection in CSI is modeled to be bound within an ellipsoidal set, which is used to model the uncertainty between the true and the estimated channel coefficients. Using the S-procedure, we cast the original non-convex problem into a tractable formulation with convex constraints in linear matrix inequality (LMI) form and solve it using the standard semidefinite relaxation (SDR). The results confirm the effectiveness of the proposed robust scheme, in terms of power efficiency at BSs, compared with the conventional method in the presence of imperfect CSI.
Starting Page	4916
Ending Page	4920
File Size	128887
Page Count	5
File Format	PDF
ISBN	9781467331227
ISSN	15503607
DOI	10.1109/ICC.2013.6655356
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-06-09
Publisher Place	Hungary
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Interference Robustness Downlink Signal to noise ratio Array signal processing Antennas Vectors ellipsoid set Robust beamforming LMI
Content Type	Text
Resource Type	Article

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