On the spectral efficiency of full-duplex massive MIMO heterogeneous network with MRC method

In this paper, we focus on a full-duplex (FD) two-tier heterogeneous network (HetNet) where both macro base station (MBS) and pico base stations (PBS) are equipped with large-scale uniform linear antenna array (ULA). FD and massive multi-input multi-output (Massive MIMO) techniques are utilized to achieve better Quality of Service (QoS) and higher throughput. The asymptotic uplink and downlink signal-to-interference-plus-noise ratio (SINR) of the received signal using maximum ratio combination/transmission (MRC/MRT) precoding method is analyzed. In order to solve the problem that severe cross-layer interference worsens signals and constrains the performance of the HetNet, a geometric programming (GP) based power control scheme is proposed to suppress the interference and improve the SE of the HetNet. Simulation results show that by utilizing the proposed power control scheme in uplink and downlink transmission, the cross-layer interference can be greatly suppressed and the SE of the HetNet can be effectively enhanced.