Adaptive Beamforming for Multi-Function In-Band Full-Duplex Applications

The ability of in-band full duplex (IBFD) technology to support multiple simultaneous functions within wireless systems will enable it to be adopted into both existing networks and innovative applications that have not yet been fully realized. In order to accomplish this goal, an effective way to mitigate the consequential self-interference must be employed. One of the many techniques considered to do this is adaptive beamforming for IBFD designs with antenna arrays, which offers untapped potential. This article provides background on beamforming approaches that have been used within IBFD systems, and presents a survey of published results to quantify the performance of these methods. Additionally, the design of two of the highest-isolation prototypes are discussed within the context of providing practical examples for both omnidirectional and directional architectures. Overall, this conversation highlights the use of adaptive beamforming within IBFD systems, and illustrates how it is poised to become more prevalent within future wireless networks.