Achieving energy efficiency fairness in multicell MISO downlink
Nguyen, Kien-Giang; Tran, Le-Nam; Tervo, Oskari; Vu, Quang-Doanh; Juntti, Markku (2015-05-21)
K. G. Nguyen, L. N. Tran, O. Tervo, Q. D. Vu and M. Juntti, "Achieving Energy Efficiency Fairness in Multicell MISO Downlink," in IEEE Communications Letters, vol. 19, no. 8, pp. 1426-1429, Aug. 2015. doi: 10.1109/LCOMM.2015.2436382
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We investigate the fairness of achievable energy efficiency in a multicell multiuser multiple-input single-output (MISO) downlink system, where a beamforming scheme is designed to maximize the minimum energy efficiency among all base stations. The resulting optimization problem is a nonconvex max-min fractional program, which is generally difficult to solve optimally. We propose an iterative beamformer design based on an inner approximation algorithm which aims at locating a Karush-Kuhn-Tucker solution to the nonconvex program. By novel transformations, we arrive at a convex problem at each iteration of the proposed algorithm, which is amendable for being approximated by a second order cone program. The numerical results demonstrate that the proposed algorithm outperforms the existing schemes in terms of the convergence rate and processing time.
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