Power control for multiple interfering D2D communications underlaying cellular networks: An approximate interior point approach

Device-to-device (D2D) communication is a promising technique to enhance spectrum efficiency of the cellular systems by enabling direct transmissions between end users close to each other. However, the arising interference issue should be carefully addressed to obtain the potential spectrum efficiency gains. In this paper, we develop an approximate interior point method to maximize the sum throughput of the D2D pairs underlaying cellular networks, while satisfying the rate requirement of the cellular user. The key of the approximate interior point method is to replace the time-consuming inversion of Hessian matrix with a simple diagonal one, by which we can update Newton step quickly. Simulation results show that our proposed algorithm can achieve near optimal throughput with lower computational complexity compared to other methods.