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.

Additional Metadata
Keywords coordinated transmission, Distributed antenna systems, port selection, randomization, semidefinite relaxation
Persistent URL dx.doi.org/10.1109/ICC.2012.6363886
Conference 2012 IEEE International Conference on Communications, ICC 2012
Ahmad, T. (Talha), Gohary, R, Yanikömeroǧlu, H, Ai-Ahmadi, S. (Saad), & Boudreau, G. (Gary). (2012). Coordinated max-min fair port selection in a multi-cell distributed antenna system using semidefinite relaxation. In IEEE International Conference on Communications (pp. 3616–3620). doi:10.1109/ICC.2012.6363886