Underlaid FD D2D Communications in MU-MIMO Systems via Joint Beamforming and Power Allocation

This paper studies the benefits of incorporating underlaid full-duplex (FD) D2D communications into multi-user multiple-input-multiple-output (MU-MIMO) cellular systems in terms of achievable network throughput. The focus is joint beamforming and power allocation design for average sum-rate (per cell) maximization while considering the effects of interference to both cellular and D2D transmission. The problem formulation leads to a nonconvex vector-variable optimization problem, where we develop an efficient solution using a fractional programming (FP) based approach. Numerical results show that, at sufficiently high self-interference cancellation (SIC) levels, the FD D2D transmission provides a significant sum-rate improvement as compared to the half-duplex (HD) counterpart and pure cellular systems in absence of D2D transmission.

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