Robust power control for cognitive radio networks under spectrum sensing errors

Abstract

Orthogonal frequency division multiplexing (OFD-M)based cognitive radio networks (CRNs) is a promising paradigm to increase spectrum efficiency and achieve flexible resource allocation. However, previous works either lack the consideration of channel uncertainties or ignore the effect of imperfect spectrum sensing. In this paper, we focus on the power control for a downlink OFDM-based CRN with the consideration of both parametric uncertainties and spectrum sensing errors. A robust power control strategy based on the worst case approach to maximize achievable data rate of secondary user is proposed while satisfying the interference constraint and power budget constraint. Simulation results demonstrate that our proposed worst case approach exhibits improved performance since it can obtain a relatively good data rate and provide a better protection for primary user.