Underlaid Full-Duplex D2D Cellular Networks: Modeling and Analysis

In this paper, we provide an analytical performance characterization of underlaid device-to-device (D2D) cellular networks where D2D users operate in full-duplex (FD) mode under the presence of residual self-interference. In considered networks, the base-stations (BSs) are distributed according to a hexagonal grid, while the locations of cellular and D2D users follow Poisson point processes (PPPs). Based on stochastic-geometry approach, we develop the approximations of key performance metrics including coverage probabilities and ergodic sum-rates of both cellular and D2D links in order to investigate the benefits of integrating underlaid D2D communications in cellular networks in terms of spectral efficiency. The achieved approximations also allow to characterize the sum-rate behaviors under the effects of various system parameters. We show that underlaid D2D communications in cellular network can offer a significant spectral efficiency gain as compared to pure cellular transmission. With a sufficiently low self-interference cancellation level, FD D2D can offer substantial spectral efficiency improvement over the HD counterpart.