Suppression of Self-, Tethered- and Untethered-Interference Sources using an Advanced Radio System

Next-generation wireless networks are expected to include provisions for more optimal use of the limited frequency spectrum, which can be accomplished using in-band full-duplex (IBFD) technology. While research on IBFD systems has focused on eliminating the resulting self-interference, practical deployments will be required to additionally suppress interference from other sources. This paper presents an advanced radio architecture that can mitigate self-, on-board tethered- and external untethered-interference. The concept was validated through the measurement of a prototype system over a 20 MHz bandwidth centered at 1880 MHz, and provided more than 120 dB of total isolation with all three interference sources active.