Power Allocation for Non-Orthogonal mmWave Systems with Mixed-Traffic

In this study, we propose Power Allocation for Non-Orthogonal mmWave Systems with Mixed-Traffic. We consider the problem of power allocation for the down-link of a 5G cellular system operating in the millimetre wave (mmWave) band and serving two sets of users: fix-rate (FR) users (transmitting data at fixed rate), typically seen in device-to-device (D2D) communications, and variable-rate (VR) users (that can change their transmission data rate), typically requiring high data rate services. The power allocation objective is the maximization of the spectral efficiency (SE) of VR users, while ensuring that FR users get the required rate. 

Differently from existing literature on power allocation, we exploit the sparsity of the virtual mmWave channel matrix, obtained by applying fixed Discrete-Fourier Transform (DFT) beam formers at both the transmitter and the receiver. Exploiting the channel partial orthogonally users are first grouped based on the mutual interference then power is allocated among and within groups.