NDLI: Robust interference management via outage-constrained downlink beamforming in multicell networks

Content Provider	IEEE Xplore Digital Library
Author	Nasseri, S. Nakhai, M.R.
Copyright Year	2013
Description	Author affiliation: Centre for Telecommun. Res., King's Coll. London, London, UK (Nasseri, S.; Nakhai, M.R.)
Abstract	We introduce a downlink robust optimization problem to minimize an objective function which is a combination of a cost characterizing the total transmit power at each multiple antenna base station (BS) and a penalty term due to the induced aggregate intercell interference power across the multicell network. This optimization is constrained to assure that a set of target signal-to-interference-plus-noise ratio (SINR) levels are maintained at the intracell user terminals with adjustable outage probabilities. The involved uncertainties are due to the errors incurred in estimating both direct downlink channels within each cell and the interfering channels between a BS and the remote user terminals in other cells. By introducing a slack variable, we reformulate the problem so that the probability of imperfection in the penalty term is confined within an adjustable outage. To maintain the tractability of the robust solutions, we derive an equivalent semidefinite programming (SDP) formulation that is convex under the standard rank relaxation. Our simulation results show that at fixed outage probabilities, the proposed scheme is considerably more sensitive to imperfection in direct downlink channels than the imperfection in the interfering channels at a given BS. This observation is due to the presence of the interfering channels within the penalty term that is minimized as a part of the proposed objective function.
Sponsorship	IEEE Commun. Soc.
Starting Page	3470
Ending Page	3475
File Size	376720
Page Count	6
File Format	PDF
ISBN	9781479913534
DOI	10.1109/GLOCOM.2013.6831610
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-12-09
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Interference Signal to noise ratio Robustness Optimization Downlink Array signal processing Vectors semidefinite programming Robust CSI uncertainty intercell interference outage probability
Content Type	Text
Resource Type	Article

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