A Robust Energy Aware Power Control Algorithm with SINR-Flexible Requirement in Cognitive Radio Networks

Energy efficiency power control for dynamical cognitive radio networks is a challenging problem. In this paper, our objective is to minimize total transmit power of multiuser cognitive system while keeping the time-varying target signal-to-interference-noise-ratio (SINR) requirements constraints satisfied. In order to compensate the perturbations from new coming users, a SINR strengthen factor is introduced to keep minimum acceptable SINR for SUs. A robust energy aware distributed power control scheme with SINR-flexible requirements is proposed in which a tradeoff between power consumption and received SINR is considered. Simulation results show that our proposed scheme provides better SINR protection and robustness than the existing work which does not consider the entry of new users and the perturbation of channel gains.