One-Way Ramp to a Two-Way Highway: Integrated Magnetic-Free Nonreciprocal Antenna Interfaces for Full-Duplex Wireless

Negar Reiskarimian, Tolga Dinc, Jin Zhou, Tingjun Chen, Mahmood Baraani Dastjerdi, Jelena Diakonikolas, Gil Zussman, Harish Krishnaswamy
2019 IEEE Microwave Magazine  
S ince the invention of the radio, transmission and reception have been separated to protect the receiver (Rx) from being jammed by self-interference (SI), i.e., the interference that comes from the colocated radio transmitter (Tx). This separation is called duplexing. Today's wireless systems still rely on duplexing to avoid SI-many short-range or local area radios, such as Bluetooth and WiFi transceivers, transmit and receive in nonoverlapping time slots, called time-division duplexing (TDD),
more » ... while other modern wireless systems, such as the majority of today's cellular systems, use frequencydivision duplexing (FDD) to separate the transmission and reception in the frequency domain. Both TDD and FDD are half duplex, where the separation of the transmitted and received signals of a single user in either frequency or time causes inefficient utilization of limited wireless resources. Full-duplex (FD) wireless, an emerging wireless communications paradigm, allows simultaneous transmission and reception at the same frequency, promising a significant enhancement in spectral efficiency at the physical layer. This results in many other benefits at the wireless network level, such as achieving better spectral efficiency, reducing network and feedback signaling delays, and resolving hidden-node problems to
doi:10.1109/mmm.2018.2880497 fatcat:4wgsz2ncyrek7lh3qhtenrxdya