Large-Scale Fading Based Power Allocation for Device-to-Device Underlay Cellular Communication

Device-to-Device (D2D) underlay cellular communication has been recently considered as a popular paradigm to enhance system performance. In this paper, we study a power-allocation problem to maximize the system sum-rate while giving priority to cellular users (CUs), assuming that only large- scale fading information is known at the base station. Specifically, we give priority to CUs by introducing outage probability constraints. Further, we adopt the geometric programming technique to solve the optimal power-allocation problem. Numerical results show that the proposed outage- constrained power allocation scheme not only provides more reliable cellular communication but also improves the system sum-rate performance.