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This article provides an overview of research on full-duplex at theUniversity of California, Riverside, in the past decade. This research wasinitially focused on self-interference (SI) cancellation, then moved toapplications of full-duplex to improve network spectral efficiency, and inrecent years advanced to discover full-duplex's potentials for wireless networksecurity. The research on SI cancellation has resulted in both hardware-basedSI cancellation results and some advanced theoretical architectures which showpromises but are yet to be tested via advanced hardware implementations. Theapplications of full-duplex for optimized spectral efficiency in ad hoc,cognitive and cellular networks have shown how to optimize power allocationamong full-duplex nodes, in their antenna beamspace and over multiplesubcarriers. Full-duplex has also been found to be highly beneficial forimproving secrecy capacity between legitimate users against eavesdropping.Among the new capabilities that full-duplex provides for network security is aneffective anti-eavesdropping channel estimation scheme which is not possiblefor nodes without full-duplex.

A Research Journey of Full-Duplex at University of California from Self-Interference Cancellation to Wireless Network Security