University of Debrecen
In the previous works on Multiple-Input Multiple-Output (MIMO) interference channels, it is usually assumed that the transmit power is fixed and only MIMO beam-forming is applied to mitigate interference. In this paper, the authors design the transmit powers and beam-forming vectors jointly for each transmit-receive pairs (links) to maximize the energy efficiency in MIMO interference channels. Centralized and decentralized energy-efficient beam-forming algorithms are developed based on global and local Channel State Information (CSI) at each transmitter, respectively. The decentralized scheme can be combined with scheduling to achieve good performance when the interference among links cannot be canceled.