Energy efficient resource allocation in MIMO-OFDMA downlink systems

Abstract

This paper studies subcarrier allocation and pre-coder design for energy efficiency (EE) maximization in downlink multiple-input-multiple-output (MIMO)- orthogonal frequency-division multiple access (OFDMA) systems. We first propose a subcarrier allocation approach based on time-sharing. Then we show that the proposed subcarrier allocation results in a discontinuous quasi-concave EE function. Finally, we propose an algorithm to maximize EE. Numerical results show that the proposed algorithm efficiently finds the maximum of EE.