title: A novel utility function for energy-efficient power control game in cognitive radio networks.
abstract: Spectrum scarcity is a major challenge in wireless communications systems requiring efficient usage and utilization. Cognitive radio network (CRN) is found as a promising technique to solve this problem of spectrum scarcity. It allows licensed and unlicensed users to share the same licensed spectrum band. Interference resulting from cognitive radios (CRs) has undesirable effects on quality of service (QoS) of both licensed and unlicensed systems where it causes degradation in received signal-to-noise ratio (SIR) of users. Power control is one of the most important techniques that can be used to mitigate interference and guarantee QoS in both systems. In this paper, we develop a new approach of a distributed power control for CRN based on utility and pricing. QoS of CR user is presented as a utility function via pricing and a distributed power control as a non-cooperative game in which users maximize their net utility (utility-price). We define the price as a real function of transmit power to increase pricing charge of the farthest CR users. We prove that the power control game proposed in this study has Nash Equilibrium as well as it is unique. The obtained results show that the proposed power control algorithm based on a new utility function has a significant reduction in transmit power consumption and high improvement in speed of convergence.
authors.affiliation: Department of Electrical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur, Malaysia.
authors.forename: Yousef Ali
authors.initials: YA
authors.lastname: Al-Gumaei
authors.affiliation: Department of Electrical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur, Malaysia.
authors.forename: Kamarul Ariffin
authors.initials: KA
authors.lastname: Noordin
authors.affiliation: Department of Electrical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur, Malaysia.
authors.forename: Ahmed Wasif
authors.initials: AW
authors.lastname: Reza
authors.affiliation: Department of Electrical and Electronics Engineering, Faculty of Engineering, National Defence University of Malaysia, Kuala Lumpur, Malaysia.
authors.forename: Kaharudin
authors.initials: K
authors.lastname: Dimyati
mesh_terms: D000465:Algorithms; D003195:Computer Communication Networks / Q000295:instrumentation* / Q000706:statistics & numerical data; D005716:Game Theory; D006801:Humans; D059629:Signal-To-Noise Ratio; D059015:Wireless Technology / Q000295:instrumentation* / Q000706:statistics & numerical data