Robust Energy Efficiency Power Allocation for Uplink OFDM-Based Cognitive Radio Networks

Energy-Efficient Power Allocation Using Probabilistic Interference Model for OFDM-Based Green Cognitive Radio Networks

We study the energy-efficient power allocation techniques for OFDM-based cognitive radio (CR) networks, where a CR transmitter is communicating with CR receivers on a channel borrowed from licensed primary users (PUs). Due to non-orthogonality of the transmitted signals in the adjacent bands, both the PU and the cognitive secondary user (SU) cause mutual-interference. We assume that the statist...

Distributed Uplink Resource Allocation in Cognitive Radio Networks -- Part I: Equilibria and Algorithms for Power Allocation

Spectrum management has been identified as a crucial step towards enabling the technology of a cognitive radio network (CRN). Most of the current works dealing with spectrum management in the CRN focus on a single task of the problem, e.g., spectrum sensing, spectrum decision, spectrum sharing or spectrum mobility. In this two-part paper, we argue that for certain network configurations, jointl...

X Power Allocation in OFDM-Based Cognitive Radio Systems

Power Allocation in OFDM-Based Cognitive Radio Systems

In this thesis, we develop an subcarrier transmission suboptimal power allocation algorithm and an underlay subcarrier transmission optimal power allocation algorithm for the orthogonal frequency division multiplexing (OFDM)-based cognitive radio (CR) systems with different statistical interference constraints imposed by different primary users (PUs). Given the fact that the interference constr...

A Robust Power Allocation Algorithm in Cognitive Radio Networks ⋆

Traditional distributed resources allocation algorithms are based on the hypothesis of perfect channel in cognitive radio networks. In fact, the parameters of the channel are variable, uncertain in some degree or even turbulent. Considering an ellipsoidal uncertainty set to describe the fluctuation of the interference gain, a robust power allocation algorithm is proposed to maximize the data ra...