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This paper studies the benefits of incorporating underlaid full-duplex (FD)device-to-device (D2D) communications into massivemultiple-input-multiple-output (MIMO) downlink systems. Due to the nature ofcellular downlink and FD D2D transmission, the performances of cellular and D2Dservices are severely impaired due to high interference caused by base-stations(BSs) and D2D transceivers. As a consequence, integrating a large number of D2Dlinks into exiting cellular networks might degrade the system performances. Toovercome this challenge, utilizing the large uniform linear array (ULA)equipped at BSs, we propose a joint beamforming and power allocation design foraverage sum-rate maximization while considering the effects of interference toboth cellular and D2D transmission. The problem formulation leads to anonconvex vector-variable optimization problem, where we develop an efficientsolution using a fractional programming (FP) based approach. Numerical resultsshow that, at sufficiently high self-interference cancellation (SIC) levels andnumbers of active D2D links, the FD D2D transmission provides a significantsum-rate improvement as compared to the half-duplex (HD) counterpart and purecellular systems in absence of D2D.

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