Power Allocation Optimization for Full-Duplex D2D Communications Underlaying Cellular Networks

摘要

In this paper, we investigate power allocation for full-duplex (FD) device-to-device (D2D) communications underlaying cellular network. A new FD D2D communications framework for wireless cellular networks has been proposed by applying full-duplex transmission into D2D communications. In the scenario we consider, the FD D2D pair reuses the uplink frequency resources of cellular users as a underlay in a wireless cellular network. The system objective is to maximize the rate of D2D link while fulfilling the minimum rate requirement of the cellular users. We derive the optimal power allocation strategy for both D2D users and cellular users. The simulation results show that the optimal power allocation strategy is correlated with the self-interference mitigation coefficients and the location of the users. The proposed FD D2D communication power allocation scheme can achieve much higher rate than the conventional half-duplex (HD) D2D communication mode when the selfinterference can be effectively suppressed, and closer separation of D2D users and farther distance from D2D pair to cellular user can make FD D2D communications more efficient.