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Enhancing Secrecy Rate in Cognitive Radio Networks via Stackelberg Game

Research output: Contribution to journalArticle

Original languageEnglish
Article number7508963
Pages (from-to)4764-4775
Number of pages12
JournalIEEE Transactions on Communications
Volume64
Issue number11
DOIs
Publication statusPublished - 12 Jul 2016

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Abstract

In this paper, a game theory based cooperation scheme is investigated to enhance the physical layer security in both primary and secondary transmissions of a cognitive radio network (CRN). In CRNs, the primary network may decide to lease its own spectrum for a fraction of time to the secondary nodes in exchange of appropriate remuneration. We consider the secondary transmitter node as a trusted relay for primary
transmission to forward primary messages in a decode-and forward (DF) fashion and, at the same time, allows part of its available power to be used to transmit artificial noise (i.e., jamming signal) to enhance primary and secondary secrecy rates. In order to allocate power between message and jamming signals, we formulate and solve the optimization problem for maximizing the secrecy rates under malicious attempts from EDs. We then analyse the cooperation between the primary and secondary nodes from a game-theoretic perspective where we model their interaction as a Stackelberg game with a theoretically proved and computed Stackelberg equilibrium. We show that the spectrum leasing based on trading secondary access for cooperation by means of relay and jammer is a promising framework for enhancing security in CRNs.

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