The demand for increasing mobile communication data rates and number of users is large with mobile traffic growing 20% every year for the last years with the total traffic expected to be tripled by 2030. However, the limited radio spectrum allocated for mobile communications limits severely this increase. Future in-band full-duplex (IBFD) technology promises a breakthrough by enabling simultaneous transmission and reception at the same frequency band, thus doubling the spectral efficiency and capacity compared to current mobile communication systems. However, the problem of IBFD is the strong self-interference from the transmitter to the receiver. In this research project, methods are developed to achieve very high antenna isolation in phone antennas together with a novel chip-based RF-canceller and digital cancellation algorithms. These methods allow cancelling of the self-interference down to the noise floor of the receiver enabling in-band full-duplex communications.

2025

2029