Artificial Noisy MIMO Systems Under Correlated Scattering Rayleigh Fading—A Physical Layer Security Approach

Abstract

The existing investigations on artificial noise (AN) security systems assumed that only null spaces is used to send AN signals, and all eigen-subchannels should be used to transmit messages. Our previous work proposed an AN scheme that allocates some of eigen-subchannels to transmit AN signals for improving secrecy rates. Nevertheless, our previous work considered only uncorrelated MIMO Rayleigh fading channels. In fact, the correlations among antennas exist in realistic scattering channel environments. In this paper, we extend our previous AN scheme to spatially correlated Rayleigh fading channels at both legitimate receiver-and eavesdropper-sides and derive an exact theoretical expression for the ergodic secrecy rate of the AN scheme, along with an approximate analysis. Both numerical and simulation results show that the proposed AN scheme offers a higher ergodic secrecy rate than the existing schemes, revealing a fact that the correlation among eavesdropper's antennas can potentially improve the secrecy rate of an MIMO system.

Energy-Efficient and Physical Layer Secure Computation Offloading in Blockchain-Empowered Internet of Things

“…4a, we can find that the ergodic secrecy rate increases with the increasing number of IRS elements. Also, a comparison is taken between IRS-assisted PLS and the secure beamforming scheme that uses N t = N + 1 transmission antennas in the case of N b = 1 and N e = 1 [13]. From the comparison simulations, we find that the IRS-assisted PLS outperforms the secure beamforming scheme because the channel gain by IRS is larger than that of the beamforming scheme [37].…”

“…The secrecy rate can be viewed as the inherent property for a given instantaneous CSI realization. The ergodic secrecy rate is the average value of secrecy rates among all realizations of CSIs, which is a usual metric for PLS schemes [3], [13]. As the CSIs of wiretap channels are unknown, to calculate the ergodic secrecy rate, the gain of wiretap channels in Eq.…”

“…With Lemma 1, we deduce the expression of ergodic secrecy rate with optimal phase shift matrix Φ * i . The ergodic secrecy rate is defined as follows [13],…”

“…Hence, the security of links from the sensors to the MEC servers cannot be protected effectively. In addition, due to the cost constraint of sensor devices, traditional PLS schemes, such as multiple-antenna beamforming or artificial noise technologies [13], are not suitable for IoT networks.…”

2020 Index IEEE Systems Journal Vol. 14

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