Outage probability for underlaying Device to Device communications

摘要

One of the key strategies for increasing throughput and optimum resource allocation in 5G communications is Device to Device (D2D) communications which can be obtained by minimizing the outage probability. In order to minimize the outage probability, it should be modeled by considering the effect of interference, noise and multipath phenomena in a joint state. In this paper, by considering the statistical models of Additive White Gaussian Noise (AWGN) and Rayleigh multipath fading in two scenarios, the exact formulas for outage probability of a D2D communications underlying cellular network is proposed. In the first scenario, each D2D pair is allowed to reuse radio resource of one cellular user whereas in the second scenario, resources of two cellular users can be reused. The proposed formulas are compared to the approximate (non-exact) ones. The comparative study for the first and second scenarios show that the non-exact formula and the proposed exact one are in accordance with simulation results in MATLAB. As a remarkable result, based on Non Orthogonal Multiple Access (NOMA) approach, two approximations for the non-exact and the proposed formulas are extracted which are acceptable for multiple resource reuse scenario. Finally, simulation results show that multiple reuse scenario offers higher throughput in an acceptable outage probability compared to one reuse scenario when the distance between the D2D pair and respected cellular user is more than 71m.