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Robust downlink beamforming with imperfect CSI

Research output: Contribution to journalConference paper

Original languageEnglish
Pages (from-to)4916 - 4920
Number of pages5
JournalIEEE International Conference on Communications (ICC)
Publication statusPublished - Jun 2013
Event2013 IEEE International Conference on Communications, ICC 2013 - Budapest, United Kingdom
Duration: 9 Jun 201313 Jun 2013

King's Authors


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.

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