Abstract
This paper investigates the problem of secure and reliable communications for cognitive radio networks. More specifically, we consider a single input multiple output cognitive model where the secondary user (SU) faces an eavesdropping attack while being subject to the normal interference constraint imposed by the primary user (PU). Thus, the SU must have a suitable power allocation policy which does not only satisfy the constraints of the PU but also the security constraints such that it obtains a reasonable performance for the SU, without exposing information to the eavesdropper. We derive four power allocation policies for different scenarios corresponding to whether or not the channel state information of the PU and the eavesdropper are available at the SU. Further, we introduce the concept secure and reliable communication probability (SRCP) as a performance metric to evaluate the considered system, as well as the efficiency of the four power allocation policies. Finally, we present numerical examples to illustrate the power allocation polices, and the impact of these policies on the SRCP of the SU.
Highlights
A cognitive radio network (CRN) is widely known as a promising solution to enhance spectrum utilization by means of dynamic spectrum access techniques [1,2,3,4,5,6,7,8,9,10]
In a CRN, there are two types of users known as primary user (PU) and secondary user (SU), where the (SU) is allowed to access the spectrum licensed to the (PU) as long as it does not degrade the performance of the (PU)
In [15], the authors studied the primary user emulation (PUE) attack and proposed a solution to reduce the PUE attack in CRN operating in the frequency digital TV (DTV) band
Summary
A cognitive radio network (CRN) is widely known as a promising solution to enhance spectrum utilization by means of dynamic spectrum access techniques [1,2,3,4,5,6,7,8,9,10]. Motivated by all the above works and the references therein, in this paper, we evaluate secure and reliable communication for a single-input multiple-output (SIMO) CRN. We assume that the secondary transmitter (STx) and the primary transmitter (p-Tx) are equipped with a single antenna, while the primary receiver (P-Rx), secondary receiver (S-Rx), and the eaversdropper (EAV) have multiple antennas This system model is considered as an instance of a practical scenario where the P-Tx and S-Tx may be wireless sensors or mobile users, while the P-Rx and S-Rx may be access points or base stations. Based on the CSI available at the S-Tx, power allocation policies are derived for four scenarios as follows. Given the four power allocation policies, the the secure and reliable communication probability (SRCP) is introduced to analyse the performance of the considered CRN.
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