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International Conference on Communication Engineering and Technology (ICCET)

Macro-diversity Enhanced Physical Layer Security

Yanjun Yao, Weilong Ren

Published Apr 1, 2019• 0 citations
Publisher

Abstract

The paper tackles with the issue of physical layer security. Inspired by the thought of soft handover mechanism in cellular networks, this paper considers utilizing both macro-diversity and multi-antenna gain to enhance security performance. Following the idea, transmit antenna selection (TAS) and cooperative communication strategy is proposed. TAS is used to take advantage of multi-antenna diversity, while cooperative communication is proposed to make use of macro-diversity from different base stations. Under the considered scenario, we first calculate the expressions of the probability density function of the SNR at the receivers. Next, we get the new closed-form expressions of non-zero secrecy capacity probability, the exact and asymptotic secrecy outage probability. Lastly, we derive the cooperation mechanism between the transmitters. Numerical simulation results demonstrate that the proposed TAS and cooperative communication scheme outperforms the TAS method without cooperation.

DOI
10.1109/iccet.2019.8726921

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The paper tackles with the issue of physical layer security. Inspired by the thought of soft handover mechanism in cellular networks, this paper considers utilizing both macro-diversity and multi-antenna gain to enhance security performance. Following the idea, transmit antenna selection (TAS) and cooperative communication strategy is proposed. TAS is used to take advantage of multi-antenna diversity, while cooperative communication is proposed to make use of macro-diversity from different base stations. Under the considered scenario, we first calculate the expressions of the probability density function of the SNR at the receivers. Next, we get the new closed-form expressions of non-zero secrecy capacity probability, the exact and asymptotic secrecy outage probability. Lastly, we derive the cooperation mechanism between the transmitters. Numerical simulation results demonstrate that the proposed TAS and cooperative communication scheme outperforms the TAS method without cooperation.
Physical layer security has attracted tremendous attention in recent years. This paper proposes a novel transmit antenna selection and cooperative communication design to enhance physical layer security. The proposed scheme is brought up in order to take full advantage of macro diversity, so that security performance can be enhanced to some extent. Specifically, we consider the scenario which contains two cooperative transmitters, one legitimate receiver and one eavesdropper. We first illustrate the proposed scheme, under which we derive the expressions of the probability density function of the signal-to-noise ratio at the receivers. We then derive the exact expression of secrecy outage probability. Following that, the cooperation method, which refers to the optimal power allocation strategy between the two transmitters is raised. Numerical simulation results show that compared with traditional TAS method without cooperation, the proposed scheme achieves better performance.
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 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 propose and analyze transmit antenna selection (TAS) to enhance physical layer security in a wiretap channel with multiple antennas at the transmitter, the receiver, and the eavesdropper. We consider the practical scenario of passive eavesdropping, where the transmitter does not have any channel state information (CSI) of the eavesdropper's channel. In the main channel between the transmitter and the receiver, we select a single antenna at the transmitter that maximizes the instantaneous signal-to-noise ratio (SNR) at the receiver. At the receiver and the eavesdropper, we consider two combining techniques: 1) maximal-ratio combining (MRC) and 2) selection combining (SC). For non-identical Rayleigh fading between the main channel and the eavesdropper's channel, we first derive new closed-form expressions for the exact and asymptotic secrecy outage probabilities. The asymptotic results accurately reveal the secrecy diversity order and the secrecy array gain. Next, we derive new closed-form expressions for the probability of positive secrecy and characterize the ε-outage secrecy capacity. We show that, under TAS/MRC and TAS/SC protocols, the secrecy outage probability approaches zero and the ε-outage secrecy capacity increases with increasing number of transmitter antennas.
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.
We propose and analyze transmit antenna selection (TAS) to enhance physical layer security in a wiretap channel with NAantennas at the transmitter, NBantennas at the receiver, and NEantennas at the eavesdropper. We focus on the practical scenario where the transmitter does not have any channel state information (CSI) of the eavesdropper's channel. The transmitter selects a single antenna that maximizes the instantaneous signal-to-noise ratio (SNR) at the receiver. The receiver and the eavesdropper employ either maximal-ratio combining (MRC) or selection combining (SC) to combine the received signals. For the proposed protocols, we derive new closed-form expressions for the probability of non-zero secrecy capacity. We consider Nakagami-m fading with non-identical fading parameters of the main channel, mB, and of the eavesdropper's channel, mE. Next, we derive new closed-form expressions for the exact secrecy outage probability, based on which the ε-outage secrecy capacity is characterized. Based on the exact expressions, we derive the asymptotic secrecy outage probability which accurately reveals the secrecy diversity order and the secrecy array gain. We confirm that the proposed protocols achieve identical secrecy diversity orders of NANBmB. An interesting conclusion is reached that this diversity order is independent of NEand mE. Furthermore, we prove that under the proposed protocols, the secrecy outage probability and the ε-outage secrecy capacity improve with increasing NA.