Capacity gain analysis for underlaying full-duplex D2D communications with a novel interference management scheme

Full-duplex (FD) communication is a promising technique that permits a node to simultaneously transmit and receive on the same frequency band. When the FD device-to-device (D2D) communications are permitted to share the same frequency bands with cellular communications, the spectrum efficiency can be further enhanced, whereas the interference environment becomes more severe. Therefore, we propose a novel interference limited area (ILA) scheme to mitigate the interference from cellular communications to FD D2D communications. Under the proposed scheme, the approximate lower bound of the ergodic capacity for FD D2D communications with imperfect self-interference cancellation (SIC) is derived in a closed form. And then, the effective capacity gain of FD D2D-included networks is analyzed. Numerical results show that, with the sufficient SIC, the capacity gain offered by FD D2D communications is much better than that of the half-duplex (HD) D2D communications.