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Physical Layer Security Enhancement of Space-Time Block Code Using Channel Prediction for Antenna Selection

QIAN Hui, LI Guangqiu, WANG Lingbo, CAI Jianhui

Published Feb 1, 2020• 0 citations
Publisher

Abstract

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.

DOI
10.19678/j.issn.1000-3428.0053779

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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 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.
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.
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.
In this paper, the physical layer security of multiple-input multiple-output (MIMO) wiretap channels with orthogonal space-time block codes (OSTBCs) and arbitrary antenna correlation is investigated. In our analysis, we consider general correlation matrices with arbitrary eigenvalue distributions. Also, in order to study the impact of the line-of-sight condition on the secrecy performance, the main channel is assumed to undergo Rician fading, while the eavesdropper one experiences Rayleigh fading. An easy-to-evaluate, closed-form expression for the secrecy outage probability is derived, from which an asymptotic analysis is carried out. Representative numerical results are plotted and validated through Monte Carlo simulations. Insightful discussions regarding the impact of the multiple antennas, correlation, and Rician factor on the secrecy outage performance are provided.
We analyze the physical layer security of a communication scheme with a multiple antenna legitimate transmitter, employing transmit antenna selection (TAS), and a single antenna legitimate receiver in the presence of a single antenna eavesdropper. We developed closed-form expressions for the analysis of the secrecy outage probability supposing independent and quasi-static Rayleigh fading channels. Our results show that the secrecy outage probability is considerably increased when multiple antennas are available at the legitimate transmitter. Moreover, due to the use of the TAS technique, the eavesdropper is not able to exploit the additional spatial diversity offered by the legitimate transmitter.
We investigate the physical layer security for opportunistic scheduling scheme using transmit antenna selection (TAS) with maximal ratio combining (MRC) at receiver and eavesdropper under a quasi-static Rayleigh fading channel. We assume a scenario composed of a single transmitter, multiple users and a single eavesdropper each equipped with multiple antennas. The transmitter selects best transmit antenna and best user to enhance the secure communication. A theoretical analysis is performed to derive new closed form expressions for probability of positive secrecy and outage probability at a normalized secrecy rate. Furthermore, asymptotic analysis on the outage probability reveals the outage diversity gain and array gain. It is confirmed that number of antennas at eavesdropper impacts on secrecy array gain while the outage diversity gain is determined by the product of number of users and antennas at the transmitter and the user. From numerical results, TAS is verified as a suitable option for secure opportunistic scheduling.