A robust uplink power control for cognitive radio networks
Zahed Hossain, Ummy Habiba, M. A. Matin · 2010
In our paper, we have addressed the power control issue of the cognitive radio network maintaining insignificant interference level to the primary users (PUs) as the power control algorithms ensure less interference to PUs as well as maximum SINRs for all secondary users (SUs) minimizing the total transmitting power of the secondary network. Power control through weighted least square (WLS) approach provides protection to PUs from the harmful interference induced by SUs but fails to support all the SUs with SINRs above minimum required value. To overcome this drawback, we propose an iteratively reweighted least squares (IRLS) based power control algorithm that provides SINRs to all the SUs above a threshold value maintaining acceptable interferences to PUs caused by SUs in the cognitive radio network. Our simulation result compares the performance of IRLS solution with the WLS solution and shows the convergence behavior of our algorithm.