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Intercell interference management for downlink beamforming with imperfect CSI

Research output: Chapter in Book/Report/Conference proceedingConference paper

Original languageEnglish
Title of host publicationProceedings of 21st European Wireless Conference, European Wireless 2015
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Print)9783800739769
Publication statusPublished - 20 May 2015
Event21st European Wireless Conference, European Wireless 2015 - Budapest, Hungary
Duration: 20 May 201522 May 2015

Conference

Conference21st European Wireless Conference, European Wireless 2015
CountryHungary
CityBudapest
Period20/05/201522/05/2015

King's Authors

Abstract

In this paper, we consider an optimum multicell downlink beamforming that minimizes 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). Users on the cell edge mostly suffer from severe interference, which result in low data rate. The aim is to ensure that the data rate at the cell edge users for any given transmit power remains above the required level. We consider a spherical uncertainty set to model the imperfection in CSI between the true and the estimated channel coefficients. The original non-convex problem is formulated as the second-order cone programming (SOCP) and then recast the convex constraints into a tractable formulation in linear matrix inequality (LMI) form. Finally, we evaluate the effectiveness and efficiency of the proposed SOCP robust method with different values of the error radii and compared against the conventional and non-robust approach through numerical simulations.

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