Energy-efficiency maximization for multi-antenna OFDMA networks

Energy efficient or green communication has been one of the most important targets of the next generation communication systems in the last years because of the massive energy usage. In the light of these targets, energy efficient communication is studied for the multi-antenna Orthogonal Frequency Division Multiple Access (OFDMA) cellular networks in this study. Energy efficiency maximization problem is defined by considering the quality of service requirements of the users. A solution which allocates sub-bands and power disjointly is proposed for this complex Mixed-integer non-linear programming (MINLP) type problem, which is in the fractional form and contains not only discrete but also continuous parameters. The performance of the proposed solution is evaluated by using simulation results.