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IEEE International Conference on Communication Software and Networks

Secrecy performance of MIMO wiretap channels with Nakagami-m antenna correlation

Gangcan Sun, Zhuo Han, Mengge Liu

Published May 1, 2017• 0 citations
Publisher

Abstract

Secrecy performance based on TAS/MRC scheme with Nakagami-m antenna correlation was investigated in MIMO wiretap channels. New closed-form expressions of the exact secrecy outage probability and the probability of positive secrecy were presented. For further insights, the asymptotic secrecy outage probability in the high SNR region was also derived. It is confirmed that antenna correlation has no effects on diversity order. Most importantly, we concluded that higher antenna correlation at receiver offers more beneficial effects on secrecy performance when average SNR of the main channel is at low level, but it imposes more detrimental effects when average SNR of the main channel is at medium and high level. Finally, we provide Monte Carlo simulations to verify the analytical results.

DOI
10.1109/iccsn.2017.8230090

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Secrecy performance based on TAS/MRC scheme with Nakagami-m antenna correlation was investigated in MIMO wiretap channels. New closed-form expressions of the exact secrecy outage probability and the probability of positive secrecy were presented. For further insights, the asymptotic secrecy outage probability in the high SNR region was also derived. It is confirmed that antenna correlation has no effects on diversity order. Most importantly, we concluded that higher antenna correlation at receiver offers more beneficial effects on secrecy performance when average SNR of the main channel is at low level, but it imposes more detrimental effects when average SNR of the main channel is at medium and high level. Finally, we provide Monte Carlo simulations to verify the analytical results.
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In this paper, we analyze the impact of the antenna correlation on the secrecy of multiple-input multiple-output (MIMO) wiretap channels with multiple eavesdroppers, where transmit antenna selection (TAS) and maximal-ratio combining (MRC) are employed at the transmitter, receiver and eavesdroppers, respectively. For the practical passive eavesdropping, we first develop new and closed general formulas for the secrecy outage probability and the probability of non-zero secrecy capacity to characterize the effect of spatial correlation, and results prove that the enhanced security performance can be achieved when multiple antennas are provided at the transmitter. We then explore how spatial correlation affects the asymptotic secrecy outage probability, and the secrecy diversity order is revealed. Based on these, the results show that when the average SNR of the main channel is relatively low, higher antenna correlation is more perfect to the secrecy. When the average SNR of the main channel is relatively high, higher antenna correlation is more destructive to the secrecy.
The impact of antenna correlation on secrecy performance in wireless communication networks is analyzed. This network consists of a signal antenna at the source, while receiver and eavesdropper are both equipped with multiple antennas, which are correlated in space. We employ maximal-ratio combining (MRC) scheme at the receiver and eavesdropper to combine the received signals. We assume that the main channel and the eavesdropper's channel undergo Nakagami-m fading with the fading parameters mB and mE, respectively. In this paper, we derive new closed-form expressions for the exact secrecy outage probability and the probability of positive secrecy. To verify the analytical results, we provide Monte Carlo simulations at the end.
This paper considers transmit antenna selection (TAS) and receive generalized selection combining (GSC) for secure communication in MIMO wiretap channel, where confidential messages transmitted from an NA-antenna transmitter to an NB-antenna legitimate receiver are overheard by an NE-antenna eavesdropper. We assume that the main channel and the eavesdropper's channel undergo Nakagami-m fading with fading parameters mBand mE, respectively. In an effort to assess the secrecy performance, we present a closed-form expression for the secrecy outage probability. We then derive closed-form expressions for the secrecy outage probability at high signal-to-noise ratio (SNR) for two realistic scenarios: 1) the legitimate receiver is located close to the transmitter, and 2) the legitimate receiver and the eavesdropper are located close to the transmitter. In the first scenario, we confirm that the secrecy diversity order is mBNBNA. In the second scenario, we confirm that the secrecy diversity order collapses to zero. While this may appear discouraging at a first glance, we show that low secrecy outage probability can still be achieved.
This letter investigates the secrecy performance of multiple-input single-output (MISO) wiretap channels when the eavesdropper channel is correlated with the main one. Assuming that the transmitter employs a transmit antenna selection (TAS) scheme, we derive a tight closed-form expression for the secrecy outage probability and analytically evaluate the secrecy performance. An asymptotic outage expression is also derived, from which a diversity analysis is carried out. We prove that correlation between channels works in favor at medium to high signal-to-noise ratio (SNR), however it degrades the performance at low SNR.