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Inspired by recent developments in full-duplex communications, the authors propose and study new modes of operation for Cognitive Radios with the goal of achieving improved Primary User (PU) detection and/or Secondary User (SU) throughput. Specifically, they consider an opportunistic PU/SU setting in which the SU is equipped with partial/complete Self-Interference Suppression (SIS), enabling it to transmit and receive/sense at the same time. Following a brief sensing period, the SU can operate in either simultaneous Transmit-and-Sense (TS) mode or simultaneous Transmit-and-Receive (TR) mode. They analytically study the performance metrics for the two modes, namely the detection and false-alarm probabilities, the PU outage probability, and the SU throughput.
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