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Secrecy Enhancement with Full-Duplex Radio in Wireless Networks

Abstract

Physical layer security (PLS) is an approach that provides secrecy based on information-theoretic model which does not account for any computation capability assumption or pre-installed standardized secret key generation algorithm and it is a good additional protection on the top of the existing security scheme.

This work includes two different topics for improving PLS with full-duplex radio.

In the first topic, we study the secrecy performance of several schemes for multi-antenna transmission to single-antenna users with full-duplex (FD) capability against randomly distributed single-antenna eavesdroppers (EDs). These schemes and related scenarios include transmit antenna selection (TAS), transmit antenna beamforming (TAB), artificial noise (AN) from the transmitter, user selection based their distances to the transmitter, and colluding and non-colluding EDs. The locations of randomly distributed EDs and users are assumed to be distributed as Poisson Point Process (PPP). We derive closed form expressions for the secrecy outage probabilities (SOP) of all these schemes and scenarios. The derived expressions are useful to reveal the impacts of various environmental parameters and user's choices on the SOP, and hence useful for network design purposes. Furthermore, we have investigated the secrecy performance of the scheme where multiple legitimate users are randomly located. Examples of such numerical results are discussed.

For the second topic, we present a secure downlink communication system where a transmitter sends information to multiple single antenna users under ultra reliable and low-latency communication (uRLLC) system requirement. To meet uRLLC requirement and provide secrecy against multi-antenna eavesdropper (Eve), transmitter adopts a special channel training scheme called anti-eavesdropping channel estimation (ANECE) as well as a standard transmit beamforming to send secret information in short blocklength regime. Using ANECE, two or more cooperative full-duplex radio devices obtain their receive channel state information (CSI) with respect to each other while preventing Eve from obtaining any consistent estimate of its receive CSI, which improves the secrecy of subsequent transmission of information between the devices. We derive the closed form expression of average secrecy throughput (AST) of ANECE assisted transmission. Our closed form expression of approximated AST in terms of blocklength and various controllable parameters provides useful insights to maximize AST under uRLLC requirement. In another chapter, we investigate the uplink communication system where multiple single antenna users send secret information to multi-antenna access point (AP) under ultra reliable and low-latency communication (uRLLC) system requirement. Finally, numerical results are discussed.

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