  This article provides an overview of research on full-duplex at the
University of California, Riverside, in the past decade. This research was
initially focused on self-interference (SI) cancellation, then moved to
applications of full-duplex to improve network spectral efficiency, and in
recent years advanced to discover full-duplex's potentials for wireless network
security. The research on SI cancellation has resulted in both hardware-based
SI cancellation results and some advanced theoretical architectures which show
promises but are yet to be tested via advanced hardware implementations. The
applications of full-duplex for optimized spectral efficiency in ad hoc,
cognitive and cellular networks have shown how to optimize power allocation
among full-duplex nodes, in their antenna beamspace and over multiple
subcarriers. Full-duplex has also been found to be highly beneficial for
improving secrecy capacity between legitimate users against eavesdropping.
Among the new capabilities that full-duplex provides for network security is an
effective anti-eavesdropping channel estimation scheme which is not possible
for nodes without full-duplex.
