Physical layer security in delay constrained applications
Speaker: Dr. Arsenia Chorti Associate Professor Ecole Nationale Supérieure de l' Electronique et de ses Applications (ENSEA), France
Date: 23 May 2019 Time: 11:00-12:00
Location: Seminar Room 1, FORTH, Heraklion, Crete
Host: Prof. P. Tsakalides


Low latency and security are two of the most critical requirements of fifth generation (5G) networks. In this talk, we discuss some of our recent results on topics related to delay aware physical layer security (PLS) for 5G. After a short introduction on the fundamentals of PLS, we first discuss the possibility of employing wireless shared randomness techniques to generate symmetric secret keys in delay constrained applications. Assuming a time division duplex link, we investigate whether a block of orthogonal subcarriers, can be used for “joint” data transmission and secret key generation. We formulate the respective power and subcarrier resource allocation problem as a subset-sum 0-1 knapsack problem, for which we propose a heuristic solution of linear complexity, with virtually no loss in performance. Next, we investigate the performance of non-orthogonal multiple access (NOMA) techniques when both medium access delay and security metrics are taken into consideration. We introduce the novel concept of the “effective secrecy capacity” (ESC) and investigate the downlink of a NOMA network with either an internal (i.e., one of the NOMA users) or an external eavesdropper. Lower and upper bounds are proposed for the ESC in both cases. Interestingly, it is shown that - in contrast to our earlier results for the OMA case - increasing the size of the network results in a reduction of the ESC in both eavesdropping scenarios.


Arsenia (Ersi) Chorti holds in EEE an M.Eng. degree from the University of Patras (Greece), a DEA from the University Pierre et Marie Curie (France) and a PhD in EE from Imperial College London (UK). She undertook post-doctoral positions at the Universities of Southampton (UK), TCU, FORTH-ICS (Greece), UCL (UK), and Princeton University (US). She has served as a Lecturer and Senior Lecturer at Middlesex University (UK) and the University of Essex (UK) between 2008-2010 and 2013-2017, respectively. Since September 2017, she has been an Associate Professor at ENSEA (France) and a visiting research scholar at Essex University. Her research interests span the areas of wireless communications, security and networking.

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