Secure Transmission With Artificial Noise Over Fading Channels: Achievable Rate and Optimal Power Allocation

By Xiangyun Zhou, Matthew R. McKay. IEEE Transactions on Vehicular Technology, 2010

559 citations recorded by the source corpus.

We consider the problem of secure communication with multiantenna transmission in fading channels. The transmitter simultaneously transmits an information-bearing signal to the intended receiver and artificial noise to the eavesdroppers. We obtain an analytical closed-form expression of an achievable secrecy rate and use it as the objective function to optimize the transmit power allocation between the information signal and the artificial noise. Our analytical and numerical results show that equal power allocation is a simple yet near-optimal strategy for the case of noncolluding eavesdroppers. When the number of colluding eavesdroppers increases, more power should be used to generate the artificial noise. We also provide an upper bound on the SNR, above which, the achievable secrecy rate is positive and shows that the bound is tight at low SNR. Furthermore, we consider the impact of imperfect channel state information (CSI) at both the transmitter and the receiver and find that it is wise to create more artificial noise to confuse the eavesdroppers than to increase the signal strength for the intended receiver if the CSI is not accurately obtained.

Subfields: Computer Networks and Communications, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/ada00136b5e158cad4366811a152ab1d3e007094

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Citations in the corpus

Enhancing the Physical Layer Security of Non-Orthogonal Multiple Access in Large-Scale Networks (2016, methodology): “[25] X. Zhang, X. Zhou, and M. R. McKay, “Enhancing secrecy with multiantenna transmission in wireless ad hoc networks,”IEEE Trans.”
A Survey on Multiple-Antenna Techniques for Physical Layer Security (2017, background): “In general, there are two typical scenarios for multiple-eavesdropper interception [102], [115].”
A Survey on Wireless Security: Technical Challenges, Recent Advances, and Future Trends (2015, background): “In [127], Zhou an McKay further examined the optimal transmit power sharing between the informationbearing signal and the artificial noise.”