Spectral and Energy Efficiency Analysis of mmWave Communications With Channel Inversion in Outband D2D Network

Device-to-device (D2D) communications is a promising approach for wireless communications in terms of energy and spectrum efficiency. However, such communications increase interferences in a cellular network. In this paper, we propose to lower these interferences by using millimeter wave directional antennas. To analyze the impact of these techniques, we introduce mathematical sectored antenna models that are deduced from mmWave antenna radiation patterns. Moreover, recent studies consider a constant transmit power for the devices. Nevertheless, modern communications use power control techniques to mitigate energy consumption and interferences. The main contribution of our work is the consideration of channel inversion, which is more realistic than the commonly used transmit model. Most works dealing with conventional D2D communications propose to use stochastic geometry to model a D2D-enabled network in order to evaluate the impact of interferences and noise on the various links. The objective of this paper is to analyze the SINR and the energy efficiency of outband D2D links for UEs equipped with directional mmWave antennas. To do so, we implement an energy efficiency calculation that considers both directional antennas and channel inversion. We propose to highlight the advantages and drawbacks of directional mmWave antennas in outband D2D for diverse antenna designs and different environments.