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Coordinated max-min fair port selection in a multi-cell distributed antenna system using semidefinite relaxation

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5 Author(s)
Ahmad, T. ; Dept. of Syst. & Comput. Eng., Carleton Univ., Ottawa, ON, Canada ; Gohary, R. ; Yanikomeroglu, H. ; Ai-Ahmadi, S.
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We consider the downlink of a cellular system in which each base station (BS) has multiple distributed antenna ports that are geographically dispersed over the cell. The goal of the BSs is to improve cell-edge performance by selecting the subset of ports that maximizes the minimum signal-to-interference-plus-noise ratio of the user terminals in a coordinated manner. This problem is cast as a binary-constrained optimization problem, which is known to be NP-hard. To circumvent this difficulty, the semidefinite relaxation technique is used to efficiently generate Gaussian distributed vectors. Simulation results show that rounding a relatively small number of these vectors yields close-to-optimal solutions of the original problem.

Published in:

Communications (ICC), 2012 IEEE International Conference on

Date of Conference:

10-15 June 2012