Secrecy Performance Enhancement for Underlay Cognitive Radio Networks Employing Cooperative Multi-Hop Transmission with and without Presence of Hardware Impairments

Abstract

In this paper, we consider a cooperative multi-hop secured transmission protocol to underlay cognitive radio networks. In the proposed protocol, a secondary source attempts to transmit its data to a secondary destination with the assistance of multiple secondary relays. In addition, there exists a secondary eavesdropper who tries to overhear the source data. Under a maximum interference level required by a primary user, the secondary source and relay nodes must adjust their transmit power. We first formulate effective signal-to-interference-plus-noise ratio (SINR) as well as secrecy capacity under the constraints of the maximum transmit power, the interference threshold and the hardware impairment level. Furthermore, when the hardware impairment level is relaxed, we derive exact and asymptotic expressions of end-to-end secrecy outage probability over Rayleigh fading channels by using the recursive method. The derived expressions were verified by simulations, in which the proposed scheme outperformed the conventional multi-hop direct transmission protocol.

Physical Layer Security in a Hybrid TPSR Two-Way Half-Duplex Relaying Network over a Rayleigh Fading Channel: Outage and Intercept Probability Analysis

“…Therefore, the transmit power of all sources and relays increases, leading to an increase in IP. This can be verified using Equations (17) and (18). As in Figures 3 and 4, we can see that the simulation and analytical values are the same, and the values obtained with the MRC technique are better than those obtained with the SC technique for verifying the correctness of the system performance analysis described in the third section.…”

“…With the SC technique, E will choose the max SNR from Equations (17) and (18). Hence, the end-to-end SNR at E can be expressed by…”

“…Furthermore, [17] proposed and studied robust quality-of-service-based and secrecy-rate-based secure transmission designs for a multiple-input single-output (MIMO) system with multiple eavesdroppers and a cooperative jammer. A cooperative multi-hop-secured transmission protocol to underlie cognitive radio networks was proposed and considered in [18]. The PLS problem in cognitive decode-and-forward relay networks over a Nakagami-m fading channel is discussed in [19].…”

Exploiting Direct Link in Two-Way Half-Duplex Sensor Network over Block Rayleigh Fading Channel: Upper Bound Ergodic Capacity and Exact SER Analysis

“…In this section, we present numerical results to demonstrate the system performance of the proposed system network in the above section. The correctness of the analytical analysis in the above section is verified by the Monte Carlo simulation as in [25][26][27][28][29][36][37][38][39][40][41][42][43][44].…”

“…For multiple-input multiple-output relay channels [24], proposed a low complexity dynamic antenna switching between information decoding and energy harvesting based on the principles of the generalized selection combiner. The authors in [25] proposed and studied a cooperative multi-hop secured transmission protocol to underlay cognitive radio networks by formulating an effective signal-to-interference-plus-noise ratio (SINR) as well as secrecy capacity under the constraints of the maximum transmit power, the interference threshold, and the hardware impairment level. Furthermore [26], presented a partial relay selection (PRS) protocol to enhance the secrecy performance for cooperative cognitive radio networks (CRNs).…”