Abstract:
Wireless communication has gained much importance over the past few decades.
Due to its increasing demand in industrial and military applications, the need to
secure wireless communication from un-authorized users has also gained more at-
tention. To provide secure communication various techniques and protocols have
been proposed so far and implemented at Physical layer of the network. Cognitive
Radio (CR) appeared as an emerging technique to overcome the problem of spec-
trum scarcity and with that introduced various security challenges. This research
work also proposes a system model that aims to provide secure communication over
a Cognitive Radio Network (CRN). The system model in our study consists of two
networks called the Primary Network (PN) and the Secondary Network (SN) which
collaborate and gain incentive from each other. The communication over PN takes
place in the presence of a multi-antenna Eavesdropper that aims to exploit the in-
formation transfered at PN. The communication is made secure with a help of a
SN that transmits high interference at Eavesdropper (Eve) so that the transmis-
sion rate of PN is always greater than the transmission rate at the Eavesdropper.
This article focuses on the analysis of proposed and conventional system model by
comparing the theoretical results with simulations. The theoretical results obtained
for the proposed scheme match exactly to those of the simulation results. Mutual
Outage Probability (MOP) that measures the overall reliability of the information
signal transmitted is obtained analytically and numerically. Simultaneously, Secrecy
Outage Probability (SOP) that is the measure of how secure is the transmitted in-
formation is obtained and the results are compared. In addition, the outages at
PN and SN and the Transmission Capacity of both the networks are obtained and
the results are plotted and compared against conventional scheme. The numerical
analysis done in this work shows that this system model not only provides a high
secrecy to the PN but at the same time improves outage performance and channel's
transmission capacity at the SN. However, we notice that the increase in secrecy at
PN results in some amount of signal distortion also but within acceptable limits.
