Wideband Analog Interference Cancellation Using True Time Delays, Hadamard Projections, and a Kronecker Decomposition Algorithm

Due to the increase of active transmitters such as 5G wireless systems and LEO/MEO satellites, radio frequency interference (RFI) can be strong enough to saturate analog to digital converters (ADC) in a high sensitivity receiver system. Previous work has shown it is possible to remove a single wideband RFI source in the analog domain before sampling the signal using true time delay (TTD) circuits followed by a Hadamard projection. We show how analog TTD circuits with delays constructed from a Kronecker decomposion followed by multiple Hadamard projections are capable of removing multiple wideband RFI signals before the ADC while preserving a signal of interest for downstream beamforming and increasing the dynamic range of the system.