1 Answers
Self-interference cancellation is a signal processing technique that enables a radio transceiver to simultaneously transmit and receive on a single channel, a pair of partially-overlapping channels, or any pair of channels in the same frequency band. When used to allow simultaneous transmission and reception on the same frequency, sometimes referred to as “in-band full-duplex” or “simultaneous transmit and receive,” SIC effectively doubles spectral efficiency. SIC also enables devices and platforms containing two radios that use the same frequency band to operate both radios simultaneously.
Self-interference cancellation has applications in mobile networks, the unlicensed bands, cable TV, mesh networks, the military, and public safety.
In-band full-duplex has advantages over conventional duplexing schemes. A frequency division duplexing system transmits and receives at the same time by using two channels in the same frequency band. In-band full-duplex performs the same function using half of the spectrum resources. A time division duplexing system operates half-duplex on a single channel, creating the illusion of full-duplex communication by rapidly switching back-and-forth between transmit and receive. In-band full-duplex radios achieve twice the throughput using the same spectrum resources.