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    A secure downlink NOMA scheme against unknown internal eavesdroppers
    (IEEE-Institute of Electrical and Electronics Engineers Inc., 2021) Abushattal, Abdelrahman; Althunibat, Saud; Qaraqe, Marwa; Arslan, Hüseyin
    Enhancing security level against potential internal eavesdroppers in Non-Orthogonal Multiple Access (NOMA) has been reported as a serious challenge. In this letter, a novel secure NOMA scheme based on physical-layer security concepts is proposed. The proposed scheme exploits the random and independent channel characteristics to induce a different phase shift in each user's symbol. Based on the assumption that the instantaneous channel phase between a user and the base station is available only at both ends, other users will not be able to decode the right symbol. Analytical and simulation average bit error rate performance results demonstrate the ability of the proposed scheme to degrade the performance at the eavesdropper without affecting the performance at other legitimate users and guarantee data confidentiality of each user.
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    On the inherent physical-layer security of receive spatial modulation systems
    (Institute of Electrical and Electronics Engineers Inc., 2020) Abushattal, Abdelrahman; Althunibat, Saud; Qaraqe, Marwa; Arslan, Hüseyin
    This paper investigates the physical-layer security attained by Receive Spatial Modulation (RSM) scheme against potential eavesdroppers. The impact of the involved parameters on the bit error rate (BER) at the legitimate receiver and the considered eavesdropper is shown and discussed. Moreover, a hybrid scheme is proposed in order to alleviate the impact of the channel estimation errors on the achievable BER at the legitimate receiver. The proposed scheme allows the transmitter to switch between RSM and the conventional SM based on the phase of the estimated channel coefficient. Simulation results reveal that the proposed scheme can achieve at least 3 dB SNR gain as compared to the RSM, while keeping the error rate at the eavesdropper within acceptable bound.
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    Physical layer security for wireless implantable medical devices
    (Institute of Electrical and Electronics Engineers, 2015) Ankaralı, Zekeriyya Esat; Demir, Fatih; Qaraqe, Marwa; Abbasi, Qammer Hussain; Serpedin, Erchin; Arslan, Hüseyin; Gitlin, Richard
    Wireless communications are increasingly important in health-care applications, particularly in those that use implantable medical devices (IMDs). Such systems have many advantages in providing remote healthcare in terms of monitoring, treatment and prediction for critical cases. However, the existence of malicious adversaries, referred to as nodes, which attempt to control implanted devices, constitutes a critical risk for patients. Such adversaries may perform dangerous attacks by sending malicious commands to the IMD, and any weakness in the device authentication mechanism may result in serious problems including death. In this paper we present a physical layer (PHY) authentication technique for IMDs that does not use existing methods of cryptology. In addition to ensuring authentication, the proposed technique also provides advantages in terms of decreasing processing complexity of IMDs and enhances overall communications performance.
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    Short paper: Experimental characterization of in vivo wireless communication channels
    (Institute of Electrical and Electronics Engineers, 2015) Demir, Ali Fatih; Abbasi, Qammer Hussain; Ankaralı, Zekeriyya Esat; Qaraqe, Marwa; Serpedin, Erchin; Arslan, Hüseyin
    In vivo wireless medical devices have a critical role in healthcare technologies due to their continuous health monitoring and noninvasive surgery capabilities. In order to fully exploit the potential of such devices, it is necessary to characterize the in vivo wireless communication channel which will help to build reliable and high-performance communication systems. This paper presents preliminary results of experimental characterization for this fascinating communications medium on a human cadaver and compares the results with numerical studies.