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International Conference on Information and Communication Systems (ICICS)

On the secrecy outage probability of a physical layer with MRC over mixed fading channels

Razan F. Shatnawi, Duaa Sh. Almomani, Mamoun F. Al‐Mistarihi, Mahmoud A. Khodeir

Published Apr 1, 2018• 2 citations
Publisher

Abstract

The diversity scheme has been used recently to improve the reliability of the massage signal by using two or more communication channels depending on many characteristics. Maximum Ratio Combining (MRC) is one of the diversity combining methods by which the signals from each channel are added together and the gain of each channel is made to proportionate to the root mean square signal level. In this paper a diversity technique is proposed to increase the secure capacity over wireless fading channels. The legitimate user (Bob) takes on MRC to maximize the probability of secure transmission, whereas eavesdropper takes on MRC to maximize the probability of successful eavesdropping. We assume that Bob and Eve follow different fading channels, Rayleigh and Nakagami-m, respectively. Depending on these assumptions, closed-form expression for secrecy outage probability is derived.

DOI
10.1109/iacs.2018.8355468

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The diversity scheme has been used recently to improve the reliability of the massage signal by using two or more communication channels depending on many characteristics. Maximum Ratio Combining (MRC) is one of the diversity combining methods by which the signals from each channel are added together and the gain of each channel is made to proportionate to the root mean square signal level. In this paper a diversity technique is proposed to increase the secure capacity over wireless fading channels. The legitimate user (Bob) takes on MRC to maximize the probability of secure transmission, whereas eavesdropper takes on MRC to maximize the probability of successful eavesdropping. We assume that Bob and Eve follow different fading channels, Rayleigh and Nakagami-m, respectively. Depending on these assumptions, closed-form expression for secrecy outage probability is derived.
This paper presents a method of increasing the secrecy capactty utilizing the channel diversity technique in wireless communication. In general, a relatively higher secrecy capactty can be achieved at the intended receiver by deploying channel diversity to mitigate the effect of low signal to noise ratio. In this analysis, the legitimate receiver and the eavesdropper are assumed to employ maximal ratio combining diversity technique to combine the received signals coming from the transmitter. Considering Nakagami-m wireless fading channels, dosed-form expressions for the secrecy outage probability and the probability of secrecy capacity are derived, which can be used as quality of service metrics. The numerical result confirms that the security of any wireless network model or communication system at a common operating system can be improved by using maximal ratio combining diversity technique as expected.
The impact of both maximal ratio combining (MRC) and relay selection on the physical layer security in wireless communication systems is studied by analyzing some important factors, including the probability characteristic of the legitimate receiver (Bob) and malicious eavesdropper (Eve)'s end-to-end signal-to-noise ratio (SNR), the secrecy outage probability, and the average secrecy channel capacity over Rayleigh fading Channel. We assume that Bob receives its data from both the relay and the source by cooperative communication, provided that MRC is employed at the receiver. Compared to the conventional MRC methods, a higher spatial diversity order can be exploited by performing relay selection in the proposed method, as validated via both theoretical analysis and numerical simulation. The theoretical closed-form expressions for some figures of merit, e.g., the secrecy outage probability and the average secrecy capacity, are all consistent with the numerical results.
In this correspondence, we consider a confidential communication through slow non-selective correlated Rayleigh fading channel, where a single antenna transmitter communicates at a pre-decided constant rate with a legitimate receiver in the presence of an eavesdropper. Both the legitimate receiver and eavesdropper are equipped with multiple antennas and employ maximal ratio combining (MRC) reception scheme. With the presence of channel diversity, we find the closed-form expressions for the probability of non-zero secrecy capacity and the outage probability of secrecy capacity in terms of channel parameters such as correlation coefficient and the ratio of main and eavesdropper channel gains that will be called average channel gain ratio (CGR). The analysis of secure outage performance with the MRC diversity scheme tells how the channel diversity enhances the secrecy capacity. We quantify the effect of antenna correlation on the probability of positive secrecy capacity and the secure outage probability. We also investigate how the target secrecy rate influences the effect of antenna correlation on the secure outage probability. Moreover, as a result of obtaining the closed-form expressions for the probability of positive secrecy capacity and the outage probability, it is insightful to see how the channel parameters affect the secure outage performance of the correlated channels.
This paper investigates the role of the Maximum Ratio Combining (MRC) diversity scheme in enhancing security for multicast communications over a Nakagami-0.5 fading channel in the presence of multiple eavesdroppers. The considered scenario involves a singleantenna transmitter communicating confidentially with multiple legitimate receivers, while multiple eavesdroppers attempt to intercept the transmission. Explicit mathematical formulation have been established to evaluate the likelihood of achieving a positive secrecy multicast capacity and the probability of a secure outage, providing a theoretical framework to evaluate the secrecy performance. The analysis highlights the impact of critical system parameters, including the number of legitimate receivers, the number of eavesdroppers and the number of antennas employed at both legitimate receivers and eavesdroppers. By employing MRC, which coherently combines signals from multiple antennas to maximize the received signal-to-noise ratio, the study demonstrates significant improvements in the secrecy performance of multicast systems. The findings contribute valuable insights into designing more secure multicast communication networks in the presence of severe fading and adversarial interception.
Physical Layer Security of MRC in Fisher–Snedecor FFF Fading Channels
The physical layer security (PLS) is explored in quasi-static Fisher-Snedecor F Fading Channels with maximal ratio combining (MRC), which have been used to model the conventional and emerging realistic wireless communication channels. We consider the secure transmission of privileged information from a single antenna legitimate transmitter to L-antenna legitimate receiver are wiretapped by L-antenna eavesdropper. The receiver maximizes the probability of secure transmission by adopting MRC, whereas eavesdropper maximizes the probability of eavesdropping by adopting MRC. We derive PLS secrecy metrics for a system setup where the transmitter is having no channel state information (CSI) of both the receiver and eavesdropper. Specifically, we derive a novel closed-form expressions for secure outage probability (SOP) and strictly positive secrecy capacity (SPSC). Furthermore, to obtain important insight into the effect of channel parameters on the secrecy performance, an asymptotic analysis is conducted for SOP at high signal-to-noise ratio (SNR) regime.
This paper investigates the security performance of maximal ratio combining (MRC) and optimum combining (OC) in single-input multi-output (SIMO) wiretap channels in an interference-limited environment. We assume that the legitimate receiver (Bob) and eavesdropper (Eve) are equipped with M and N antennas, respectively, and the received signals at Bob and Eve are corrupted by L interferences with equal transmission power. We consider a worst-case scenario where the channel state information (CSI) of the interference channels is available at Eve, so OC is applied at Eve for eavesdropping. Two different scenarios for Bob are considered: if the CSI of the interference channels is available, OC is applied for secure reception, otherwise, MRC is used instead. Exact and asymptotic expressions for the secrecy outage probability are derived in these two scenarios. Our results show that MRC and OC can achieve the same secrecy diversity order that depends on M only; however, OC can achieve higher array gain over MRC and the performance gap between them increases with M while decreases with L.