Browsing by Author "Boujemaa, Hatem"

Now showing 1 - 8 of 8
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    Intercept Probability and Secrecy Capacity Analysis of RIS-based Wireless Communication with Full-duplex receiver
    (Institute of Electrical and Electronics Engineers Inc., 2021) Zaghdoud, Oussama; Mnaouer, Adel Ben; Boujemaa, Hatem
    In this paper, we investigate the physical layer security of a wireless communication with a reconfigurable intelligent surface (RIS) and a full-duplex (FD) legitimate receiver over Rayleigh fading channel in the presence of an eavesdropper. In addition, we examine the scenario where the FD receiver is sending a jamming signal while receiving the required message to confuse the eavesdropper. We derive closed form expressions of the intercept probability of two scenarios with and without jamming signal and we also use the strictly positive secrecy capacity (SPSC) metric to gain more insight on the security of our proposed system. To illustrate the analytical analysis, numerical results are provided under different network parameters to study the effect of RIS and jamming technique on the security of FD receiver. © 2021 IEEE
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    Secrecy Performance Analysis of Cooperative NOMA system with multiple DF Relays
    (Institute of Electrical and Electronics Engineers Inc., 2020-06) Zaghdoud, Nesrine; Mnaouer, Adel Ben; Boujemaa, Hatem; Touati, Farid
    In this paper, we derive the Secrecy Outage Probability (SOP) and Strictly Positive Secrecy Capacity (SPSC) of cooperative Non Orthogonal Multiple Access (NOMA) in the presence of K Decode and Forward (DF) relays and Rayleigh fading channels. We also optimize the powers allocated to far and near users to maximize the SPSC or minimize the SOP. Our results are valid for any number of relays with arbitrary positions. © 2020 IEEE.
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    Secrecy Performance Analysis of Multi-Antenna NOMA System with AF/DF relaying under External and Internal Eavesdropping Scenarios
    (Institute of Electrical and Electronics Engineers Inc., 2020-06) Zaghdoud, Nesrine; Mnaouer, Adel Ben; Alouane, Wided Hadj; Boujemaa, Hatem; Touati, Farid
    Due to the successive interference cancellation (SIC) technique, Non orthogonal multiple Access (NOMA) users have the capability of decoding the other paired users sharing the same resource bloc. As a result, NOMA technique is not only exposed to external eavesdropping, but also to internal eavesdropping which raises security risks regarding NOMA users' privacy. Therefore, this research aims to analyse a Multi-antenna cooperative NOMA system where both Decode and Forward (DF) and Amplify and Forward (AF) strategies are studied. In this context, we investigate the secrecy performance of our system with both internal and external eavesdropping scenarios. Closed-form expressions of the secrecy outage probability (SOP) and the strictly positive secrecy capacity (SPSC) metrics are derived. Numerical results are given to illustrate the validity of the obtained theoretical results. © 2020 IEEE.
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    Secrecy performance of AF relaying in cooperative NOMA over rician channel
    (Institute of Electrical and Electronics Engineers Inc., 2019) Zaghdoud, Nesrine; Alouane, Wided Hadj; Boujemaa, Hatem; Mnaouer, Adel Ben; Touati, Farid
    In this paper, we investigate the secrecy performance of an Amplify-and-Forward (AF) relay in a cooperative NOMA system. The AF relay ensures the transmission of the signal in the presence of one passive eavesdropper where all channels are assumed to undergo a Rician fading. In this context, analytical and asymptotic expressions for Secrecy Outage Probability (SOP) are derived. To verify our theoretical analysis, numerical results are presented, showing the effect of different Rician factors on secrecy performance. © 2019 IEEE.
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    Secrecy Performance of AF/DF relaying in NOMA Systems using Average and Instantaneous Channel gain for users’ ranking
    (Institute of Electrical and Electronics Engineers Inc., 2020-10-20) Zaghdoud, Nesrine; Mnaouer, Adel Ben; Alouane, Wided Hadj; Boujemaa, Hatem
    In this paper, we consider a downlink cooperative NOMA system where both Decode and Forward (DF) and Amplify and Forward (AF) strategies are studied in the presence of a malicious eavesdropper. First, the secrecy outage probability (SOP) is studied when users' ranking is based on either instantaneous or average channel gains. Next, the strictly positive secrecy capacity (SPSC) is derived for users ranking based on average and instantaneous channel gains. Under this setup, we also investigate the improvement of the system secrecy using optimal power allocation (OPA) coefficients. Numerical and simulation results are provided and demonstrate that Instantaneous channel gain users' ranking provide better results and its further improved with the use of OPA. © 2020 IEEE.
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    Secrecy Performance of Cooperative NOMA System with Multiple Full-Duplex Relays against Non-Colluding/Colluding Eavesdroppers
    (Institute of Electrical and Electronics Engineers Inc., 2020-11-17) Zaghdoud, Nesrine; Mnaouer, Adel Ben; Boujemaa, Hatem; Touati, Farid
    In 5G and beyond wireless communication net-works, non-orthogonal multiple access (NOMA) and Full-Duplex (FD) techniques are considered as promising key techniques. However, the secrecy in NOMA systems has proven to be quite challenging, especially in the presence of multiple eavesdroppers. For this purpose and using the potential of cooperative and FD communication, we investigate the secrecy performance of dual-hop FD Amplify-and-Forward NOMA system. Based on the channel state information of the first hop, partial relay selection (PRS) is performed to determine the best relay. The secrecy outage behaviour of the considered system is studied through deriving closed-form expressions of the secrecy outage probability (SOP) metric for both strong and weak NOMA users under the presence of multiple eavesdroppers in colluding and non-colluding wiretapping scenarios. Numerical results are also provided to verify the derived analytical results. © 2020 IEEE.
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    Secure Performance Analysis for Full-Duplex Cooperative NOMA System in the Presence of Multiple Eavesdroppers
    (Institute of Electrical and Electronics Engineers Inc., 2020-06) Zaghdoud, Nesrine; Mnaouer, Adel Ben; Alouane, Wided Hadj; Boujemaa, Hatem; Touati, Farid
    This paper investigates the physical layer security of a full-duplex (FD) Decode-and-Forward (DF) NOMA network assumed to undergo independent and identically distributed Nakagami-m fading. Herein, we provide a secrecy performance analysis for the case of multiple external eavesdroppers in both colluding and non-colluding wiretap scenario. Our analysis introduces novel expressions of the secrecy outage probability (SOP) as well as the strictly positive secrecy capacity (SPSC) for the proposed network. Finally, numerical analysis with simulations are given to illustrate the validity of the obtained theoretical results and to highlight the impact of multiple eavesdroppers on FD NOMA systems. © 2020 IEEE.
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    Secure Performance of DF Relaying in Cooperative NOMA over Rician Fading Channels
    (Institute of Electrical and Electronics Engineers Inc., 2020-10-27) Zaghdoud, Nesrine; Mnaouer, Adel Ben; Alouane, Wided Hadj; Boujemaa, Hatem; Touati, Farid
    In this paper, a Decode-and-Forward (DF) relaying system for Non Orthogonal Multiple Access (NOMA) networks is considered, where the transmitted information between the relay and NOMA users can be overheard by an eavesdropper. In this context, we study the secrecy performance of the considered scenario under combined path loss and Rician fading. We derive novel expressions of the Secrecy Outage Probability (SOP) and the Strictly Positive Secrecy Capacity (SPSC) metrics. More Specifically, we provide the exact SOP and SPSC expressions of the near user. Unlikely, closed form expressions of the SOP and SPSC metrics for the far user are given in high signal-to-noise ratio (SNR) because of the intractable nature of the exact expressions. On this basis, numerical analysis has been firstly conducted to verify the analytical expressions. Then, the results are provided to assess the secrecy performance of our system under the effects of different network parameters. © 2020 IEEE.