Analog Cancellation of Periodic Frequency-Modulated Jamming

Abstract

Interference mitigation techniques often rely on suppressing the interference in the digital domain only. However, strong in-band interference from jamming can saturate a receiver’s front-end and, thus, limit the usefulness of plain digital methods. This is especially so in case of the self-interference (SI) encountered in enclosed full-duplex (FD) radios, but also in case of powerful interference in co-located radios. This work presents a digitally-assisted method and its implementation for the mitigation of narrowband periodic interference before quantization in co-located radios where, unlike in FD radios, the receiver does not have access to the transmitted interference waveform. Measurement results are presented that illustrate how the implementation affects GPS reception in the presence of such interference.