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Relay-selection improves the security-reliability trade-off in cognitive radio systems

Relay-selection improves the security-reliability trade-off in cognitive radio systems
Relay-selection improves the security-reliability trade-off in cognitive radio systems
We consider a cognitive radio (CR) network consisting of a secondary transmitter (ST), a secondary destination (SD) and multiple secondary relays (SRs) in the presence of an eavesdropper, where the ST transmits to the SD with the assistance of SRs, while the eavesdropper attempts to intercept the secondary transmission. We rely on careful relay selection for protecting the ST-SD transmission against the eavesdropper with the aid of both single-relay and multi-relay selection. To be specific, only the “best” SR is chosen in the single-relay selection for assisting the secondary transmission, whereas the multi-relay selection invokes multiple SRs for simultaneously forwarding the ST's transmission to the SD. We analyze both the intercept probability and outage probability of the proposed single-relay and multi-relay selection schemes for the secondary transmission relying on realistic spectrum sensing. We also evaluate the performance of classic direct transmission and artificial noise based methods for the purpose of comparison with the proposed relay selection schemes. It is shown that as the intercept probability requirement is relaxed, the outage performance of the direct transmission, the artificial noise based and the relay selection schemes improves, and vice versa. This implies a trade-off between the security and reliability of the secondary transmission in the presence of eavesdropping attacks, which is referred to as the security-reliability trade-off (SRT). Furthermore, we demonstrate that the SRTs of the single-relay and multi-relay selection schemes are generally better than that of classic direct transmission, explicitly demonstrating the advantage of the proposed relay selection in terms of protecting the secondary transmissions against eavesdropping attacks. Moreover, as the number of SRs increases, the SRTs of the proposed single-relay and multi-relay selection approaches significantly improve. Finally, our numerical results show that as expected, the multi-relay selection scheme achieves a better SRT performance than the single-relay selection.
215-228
Zou, Yulong
0359c94b-b989-448a-8164-da4047c4823f
Champagne, Benoit
34637814-cef4-4177-b5fd-d748742be072
Zhu, Weiping
101478a1-d601-49d4-91dd-afcc911f2812
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1
Zou, Yulong
0359c94b-b989-448a-8164-da4047c4823f
Champagne, Benoit
34637814-cef4-4177-b5fd-d748742be072
Zhu, Weiping
101478a1-d601-49d4-91dd-afcc911f2812
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1

Zou, Yulong, Champagne, Benoit, Zhu, Weiping and Hanzo, Lajos (2015) Relay-selection improves the security-reliability trade-off in cognitive radio systems. IEEE Transactions on Communications, 63 (1), 215-228. (doi:10.1109/TCOMM.2014.2377239).

Record type: Article

Abstract

We consider a cognitive radio (CR) network consisting of a secondary transmitter (ST), a secondary destination (SD) and multiple secondary relays (SRs) in the presence of an eavesdropper, where the ST transmits to the SD with the assistance of SRs, while the eavesdropper attempts to intercept the secondary transmission. We rely on careful relay selection for protecting the ST-SD transmission against the eavesdropper with the aid of both single-relay and multi-relay selection. To be specific, only the “best” SR is chosen in the single-relay selection for assisting the secondary transmission, whereas the multi-relay selection invokes multiple SRs for simultaneously forwarding the ST's transmission to the SD. We analyze both the intercept probability and outage probability of the proposed single-relay and multi-relay selection schemes for the secondary transmission relying on realistic spectrum sensing. We also evaluate the performance of classic direct transmission and artificial noise based methods for the purpose of comparison with the proposed relay selection schemes. It is shown that as the intercept probability requirement is relaxed, the outage performance of the direct transmission, the artificial noise based and the relay selection schemes improves, and vice versa. This implies a trade-off between the security and reliability of the secondary transmission in the presence of eavesdropping attacks, which is referred to as the security-reliability trade-off (SRT). Furthermore, we demonstrate that the SRTs of the single-relay and multi-relay selection schemes are generally better than that of classic direct transmission, explicitly demonstrating the advantage of the proposed relay selection in terms of protecting the secondary transmissions against eavesdropping attacks. Moreover, as the number of SRs increases, the SRTs of the proposed single-relay and multi-relay selection approaches significantly improve. Finally, our numerical results show that as expected, the multi-relay selection scheme achieves a better SRT performance than the single-relay selection.

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Relay-Selection Improves the Security-Reliability 0A Trade-Off in Cognitive Radio Systems - Accepted Manuscript
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Accepted/In Press date: 27 November 2014
e-pub ahead of print date: 4 December 2014
Published date: January 2015
Organisations: Southampton Wireless Group

Identifiers

Local EPrints ID: 372691
URI: http://eprints.soton.ac.uk/id/eprint/372691
PURE UUID: b03aef14-22a3-483e-b279-c3e17d55427a
ORCID for Lajos Hanzo: ORCID iD orcid.org/0000-0002-2636-5214

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Date deposited: 17 Dec 2014 15:22
Last modified: 17 Dec 2019 02:03

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Contributors

Author: Yulong Zou
Author: Benoit Champagne
Author: Weiping Zhu
Author: Lajos Hanzo ORCID iD

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