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Physical Layer Security Performance Analysis of TASP/MRC System in Multi-eavesdropper Scene

WANG Zhanwan, LI Guangqiu, QIAN Hui

Published Oct 1, 2019• 0 citations
Publisher

Abstract

In order to evaluate the physical layer security performance of Transmit Antenna Selection with channel Prediction(TASP)/receive Maximum Ratio Combining(MRC) wireless communication system over Rayleigh block fading channel in multi-eavesdropper scene,the exact analytic expressions for the non-zero security capacity probability,security outage probability and asymptotic security outage probability of TASP/MRC wireless communication systems based on Minimum Mean Square Error(MMSE) channel predictor are derived.On this basis,the impacts of the parameters such as the number of eavesdroppers,normalized feedback delay,the number of transmit/receive antennas on the physical layer security performance of system are analyzed.Numerical calculation and simulation results show that,in a TASP/MRC system,reducing the normalized delay and the number of eavesdroppers or increasing the number of legitimate receive antennas can improve the physical layer security performance.In the case of high Signal Noise Ratio(SNR),the physical layer security diversity gain is equal to the number of legitimate receive antennas,but has nothing to do with the number of eavesdropper and transmit/receive antennas.

DOI
10.19678/j.issn.1000-3428.0051994

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Aiming at Transmit Antenna Selection with Delay(TASD)/Orthogonal Space-Time Block Code(OSTBC) wireless communication system,this paper proposes a system physical layer security enhancement scheme based on the Minimum Mean Square Error(MMSE) channel predictor.The MMSE channel prediction scheme is applied to the TASD/OSTBC wireless communication system to form a channel Transmit Antenna Selection with Prediction(TASP)/OSTBC wireless communication system.The analytical expressions of secrecy outage probability,non-zero secrecy capacity probability and asymptotic secrecy outage probability over the Rayleigh block fading channel are derived.On this basis,the effects of parameters such as the number of transmit and receive antennas on the main channel,the number of eavesdropper antennas,and the normalized delay of the channel on the security performance of the system physical layer are analyzed.Numerical calculations and simulation results show that using TASP can improve the physical layer security performance of OSTBC wireless communication system.
In this paper, we present and analyze utilizing generalized selection combining (GSC) scheme to enhance the physical layer (PHY) security of a wireless communication system consisting of a single antenna transmitter, a multi-antennas receiver and a multi-antennas eavesdropper. We consider a practical scenario where GSC scheme is applied to the receiver considering both the complexity and the energy dissipation while maximal ratio combining (MRC) scheme is applied to the eavesdropper in order to maximize its instantaneous signal to noise ratio (SNR). This work bridges the gap between the existing works utilizing MRC scheme and transmit antenna selection (TAS) scheme to enhance the PHY security. Closed-form expressions for both the probability of non-zero secrecy capacity and the exact secrecy outage probability are derived over Rayleigh fading channels. The security capacity performances are also shown and analyzed through numerical results. The impacts of the number of selected branches, the average SNR of transmitter's channel and eavesdropper's channel are discussed.
The impact of feedback errors on the security performances of multiple-input multiple-output (MIMO) wiretap channels is analyzed. For the legitimate MIMO system, two schemes are considered: 1) transmit antenna selection/maximal ratio combining (TAS/MRC) and 2) transmit antenna selection/receive antenna selection (TAS/RAS). The eavesdropper uses either MRC or RAS techniques. We derive closed-form expressions for the exact secrecy outage probability (SOP) and the probability of strictly positive secrecy capacity (PSPSC). In order to obtain the secrecy diversity order and the secrecy array gain, on asymptotic SOP expression is also derived.
We introduce an opportunistic scheduling to enhance the physical layer security with transmit antenna selection (TAS) in multiuser environment. We consider a wireless communication system composed of a single transmitter and multiple legitimate users in the presence of several eavesdroppers with each node having multiple antennas under quasi-static Rayleigh fading channel. The transmitter selects the best transmitting antenna and the best user to maximize signal-to-noise ratio (SNR) at the selected user. The user and eavesdropper can employ either selection combining (SC) or maximal ratio combining (MRC) to combine the received signals. New closed-form expressions for probability of positive secrecy and outage are derived. Moreover, asymptotic analysis reveals the outage diversity gain and array gain for the proposed scheme. The impact of number of users, eavesdroppers, and antennas on secrecy performance are clearly demonstrated with mathematical analysis and numerical results.
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 paper, when transmit antenna selection (TAS) and maximal ratio combining (MRC) schemes are deployed for secrecy enhancement, the impact of channel correlation on secrecy performance is investigated over Rayleigh fading channels. Specially, both the exact and asymptotic secrecy outage probability (SOP) for TAS/MRC are derived based on a novel correlation model, where the correlated legitimate channels and eavesdropper channels are modeled as a set of conditional independent channel gains. Moreover, the lower bound of SOP is obtained in high signal-to-noise ratio (SNR) region. Finally, simulation results verify our analysis, and show that the channel correlation between the legitimate receiver and the eavesdropper is beneficial to the SOP at high SNR.