Spectral Efficiency of Massive MIMO FD Relay-Aided D2D and Cellular in HetNets with Imperfect CSI

Abstract

In this paper, we propose a model of a full duplex (FD) massive MIMO AF relay assisting D2D and cellular users simultaneously in presence of cross-tier interference and imperfect channel state information (CSI). Zero-forcing reception (ZFR)/zero-forcing transmission (ZFT) processing technique is used in the relay. The asymptotic spectral efficiency (SE) under four power scaling schemes is derived and validated by numerical results. Results show that the loop interference due to the FD nature of the relay can be eliminated by scaling down the transmitted power of the sources and the relay.