Abstract
Security and privacy are crucial for cognitive sensor radio networks (CSRNs) due to the possible eavesdropping between secondary sensors and the secondary fusion center. Motivated by this observation, we investigate the physical layer security performance of CSRNs with an external energy harvesting (EH)-based eavesdropper. Considering the underlay working paradigm of CSRNs, the transmit power of the secondary sensor node must be adjusted to guarantee the quality-of-service () of the primary user. Hence, two different interference power constraint scenarios are studied in this paper. To give an intuitive insight into the secrecy performance of the considered wiretap scenarios, we have derived the closed-form analytical expressions of secrecy outage probability for both of the considered cases. Monte Carlo simulation results are also performed to verify the theoretical analysis derived, and show the effect of various parameters on the system performance.
Highlights
Wireless sensor networks (WSNs), which often operate on the unlicensed spectrum (e.g., Industrial, Scientific, Medical (ISM) band), have been widely used in various areas such as environmental monitoring and event detection
For the EH-based eavesdropper, ρ portion of the total received power is used for information decoding, and the other remaining 1−ρ portion is used for energy harvesting
We can see that: (1) the secrecy outage probability (SOP) will decrease with the increase of the τ, which is an expected result, since the main channel has better quality than the wiretap channel; (2) with the same Pth and τ, if we increase the value of ρ, the SOP will be decreased, due to the fact that, higher values of ρ mean more power for the information decoding, which can lead to better secrecy performance; (3) with the same value of τ and ρ, if Pth, the interference power threshold is enlarged, and the secrecy performance can be further improved
Summary
Wireless sensor networks (WSNs), which often operate on the unlicensed spectrum (e.g., Industrial, Scientific, Medical (ISM) band), have been widely used in various areas such as environmental monitoring and event detection. Note that the aforementioned works mainly focus on the aspects of transmission strategy design [28], performance optimization algorithm [29,30], resource management [31,32,33], and few works have investigated the secrecy performance analysis of CSRNs. Different from [23,34], this paper investigates the physical layer security performance of CSRNs with an EH-based enemy fusion center, wherein, due to the PU’s interference temperature constraint, the transmit power of the secondary sensor transmitter (ST) is largely restrained, which has greatly affected the system transmission performance of the secondary sensor network. The EH-based enemy fusion center has the capability to overhear the confidential message of ST if they do not harvest energy as presumed In this context, we investigate the impact of an EH-based eavesdropper on the physical layer security performance of the CSRNs. The main contributions of this paper can be summarized as follows:.
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