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Relay-Selection Improves the Security-Reliability Trade-Off in Cognitive Radio Systems
By : Saviour
Date : 2018-07-15
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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 STs 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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