Spectrum sensing in cognitive radio networks imposes some security threats to the secondary users (SUs) such as primary user emulation attack (PUEA). In the present paper, throughput of an SU is studied for cognitive radio network under PUEA where SU spectrum access is hybrid, ie, either in overlay mode or in underlay mode. A novel analytical expression for throughput of an SU in presence of PUEA is developed. Impact of several parameters such as sensing time, attacker strength, attacker's presence probabilities, maximum allowable SU transmit power, and tolerable interference limit at primary user on the throughput of an SU is investigated. The throughput performance under PUEA and without PUEA is compared. Copyright © 2017 John Wiley &amp; Sons, Ltd.

Abhijit Bhowmick

Department of Communication Engineering

School of Electronics Engineering

Vellore Campus

K yadav

B prasad

Sd roy

Sumit kundu

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

International Journal of Communication Systems

In this paper two novel spectrum access schemes, a hybrid spectrum access scheme (HSAS) and a modified hybrid spectrum access scheme (MHSAS) combining underlay and overlay, are proposed to enhance the performance of cognitive radio (CR) enabled secondary user (SU) in terms of throughput and outage probability in a CR network. The CR employs an energy detection to detect the presence of primary user (PU). If PU is sensed to be present, the CR employs an underlay scheme of co-existence while the CR works in an overlay mode if the PU is sensed to be absent. In underlay mode, the transmit power of CR is controlled so as to maintain the interference at PU receiver within a tolerable limit. An imperfect CSI of the interfering link between CR transmitter and PU receiver is assumed. In HSAS, CR transmits either in underlay scheme or in overlay scheme only during the transmission phase of the detection cycle whereas in MHSAS, the CR transmits for the entire frame including the sensing period of a detection cycle. Closed form analytical expressions for the throughput and outage of CR have been developed. Impact of several sensing parameters such as sensing time, channel estimation error, tolerable interference threshold, maximum allowable transmit power of CR is investigated. The impact of collision probability on the performance of CR network due to re-arrival of PU under proposed scheme is investigated. Furthermore the performances of the proposed schemes are also compared with the conventional i.e. only underlay or only overlay schemes. Our schemes are found to outperform the conventional schemes, in terms of secondary performance. © 2016, Springer Science+Business Media New York.

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Journal	Data powered by TypesetInternational Journal of Communication Systems
Publisher	Data powered by TypesetWiley
ISSN	1074-5351
Open Access	0