Secrecy Energy Efficiency of MIMOME Wiretap Channels With Full-Duplex Jamming

• Published in: IEEE transactions on communications Vol. 67; no. 8; pp. 5588 - 5603
• Main Authors: Taghizadeh, Omid, Neuhaus, Peter, Mathar, Rudolf, Fettweis, Gerhard
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.08.2019; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Computer simulation; Electronic surveillance; Energy conversion efficiency; Energy efficiency; friendly jamming; Full-duplex; Information security; Interference cancellation; Iterative methods; Jamming; MIMO; Power efficiency; Receivers; secrecy capacity; Signal to noise ratio; Transceivers; Wireless communication; Wireless communication systems; Wireless communications; wiretap channel; Wiretapping
• ISSN: 0090-6778; 1558-0857
• DOI: 10.1109/TCOMM.2019.2915623

Full-duplex (FD) jamming transceivers recently have been shown to enhance the information security of wireless communication systems by simultaneously transmitting artificial noise (AN) while receiving information. In this paper, we investigate whether FD jamming can also improve the system's secrecy energy efficiency (SEE) in terms of securely communicated bits per Joule when considering the additional power used for jamming and self-interference (SI) cancellation. Moreover, the degrading effect of the residual SI is also taken into account. In this regard, we formulate a set of SEE maximization problems for a FD multiple-input-multiple-output multiple-antenna eavesdropper (MIMOME) wiretap channel, considering both cases where exact or statistical channel state information (CSI) is available. Due to the intractable problem structure, we propose iterative solutions in each case with a proven convergence to a stationary point. Numerical simulations indicate only a marginal SEE gain, through the utilization of FD jamming, for a wide range of system conditions. However, when SI can efficiently be mitigated, the observed gain is considerable for scenarios with a small distance between the FD node and the eavesdropper, a high signal-to-noise ratio (SNR), or for a bidirectional FD communication setup.