Title: Spectral and Energy Efficiency of Uplink D2D Underlaid Massive MIMO Cellular Networks,
Abstract: One of key 5G scenarios is that device-to-device (D2D) and massive
multiple-input multiple-output (MIMO) will be co-existed. However, interference
in the uplink D2D underlaid massive MIMO cellular networks needs to be
coordinated, due to the vast cellular and D2D transmissions. To this end, this
paper introduces a spatially dynamic power control solution for mitigating the
cellular-to-D2D and D2D-to-cellular interference. In particular, the proposed
D2D power control policy is rather flexible including the special cases of no
D2D links or using maximum transmit power. Under the considered power control,
an analytical approach is developed to evaluate the spectral efficiency (SE)
and energy efficiency (EE) in such networks. Thus, the exact expressions of SE
for a cellular user or D2D transmitter are derived, which quantify the impacts
of key system parameters such as massive MIMO antennas and D2D density.
Moreover, the D2D scale properties are obtained, which provide the sufficient
conditions for achieving the anticipated SE. Numerical results corroborate our
analysis and show that the proposed power control solution can efficiently
mitigate interference between the cellular and D2D tier. The results
demonstrate that there exists the optimal D2D density for maximizing the area
SE of D2D tier. In addition, the achievable EE of a cellular user can be
comparable to that of a D2D user.