Sensors – Special Issue on Full-Duplex Wireless Communications To meet the rising demand for high-speed data services, wireless networks must exploit the available frequency spectrum more efficiently. One key limit to spectrum utilization efficiency involves the current practice of half-duplex communication, in which a node either transmits or receives a signal in a single-channel usage. This separation prevents self-interference, which has frequently been seen as an insurmountable technical problem. Promoted by the popularity of small-cell wireless systems, recent works have…