Maximum Secrecy Throughput of MIMOME FSO Communications With Outage Constraints

• Published in: IEEE transactions on wireless communications Vol. 17; no. 5; pp. 3487 - 3497
• Main Authors: Pivaro Monteiro, Marcos Eduardo, Rebelatto, Joao Luiz, Demo Souza, Richard, Brante, Glauber
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.05.2018; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Adaptive optics; Apertures; Effective secrecy throughput; free-space optical; Free-space optical communication; Laser beams; Optical receivers; Optical transmitters; physical layer security; Reliability; wiretap channel
• ISSN: 1536-1276; 1558-2248
• DOI: 10.1109/TWC.2018.2815021

In this paper, we consider a scenario where two multiple-aperture legitimate nodes (Alice and Bob) communicate by means of free-space optical communication in the presence of a multiple-aperture eavesdropper (Eve), which is subject to pointing errors. Two different schemes are considered depending on the availability of channel state information (CSI) at Alice: 1) the adaptive scheme, where Alice possesses the instantaneous CSI with respect to Bob and 2) the fixed-rate scheme, where such information is not available at Alice. The performance of the aforementioned schemes is evaluated in terms of a recently proposed metric named effective secrecy throughput (EST), which encompasses both the reliability and secrecy constraints. By constraining the system to operate below a given maximum allowed secrecy outage probability, we evaluate the EST analytically and through numerical results, showing that the use of multiple apertures at Alice is very important toward achieving the optimal EST.