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This paper studies physical layer security in a wireless ad hoc network withnumerous legitimate transmitter-receiver pairs and eavesdroppers. A hybridfull-/half-duplex receiver deployment strategy is proposed to secure legitimatetransmissions, by letting a fraction of legitimate receivers work in thefull-duplex (FD) mode sending jamming signals to confuse eavesdroppers upontheir information receptions, and letting the other receivers work in thehalf-duplex mode just receiving their desired signals. The objective of thispaper is to choose properly the fraction of FD receivers for achieving theoptimal network security performance. Both accurate expressions and tractableapproximations for the connection outage probability and the secrecy outageprobability of an arbitrary legitimate link are derived, based on which thearea secure link number, network-wide secrecy throughput and network-widesecrecy energy efficiency are optimized respectively. Various insights into theoptimal fraction are further developed and its closed-form expressions are alsoderived under perfect self-interference cancellation or in a dense network. Itis concluded that the fraction of FD receivers triggers a non-trivial trade-offbetween reliability and secrecy, and the proposed strategy can significantlyenhance the network security performance.

Physical Layer Security in Wireless Ad Hoc Networks Under A Hybrid Full-/Half-Duplex Receiver Deployment Strategy