Interference detection in FMCW radar using a complex baseband oversampled receiver

Mutual interference between Frequency Modulated Continuous Wave (FMCW) automotive radars is expected to be a significant problem with their large scale deployment. A radar's transmit signal can corrupt a neighboring radar's received signal and result in loss of the latter's sensitivity to weak target reflections as well as make it susceptible to false target detections. Traditional radars employ real baseband Nyquist sampled receivers and traditional interference mitigation techniques rely on detection of interference using just the in-band ADC samples. In this paper, we propose the use of a complex baseband oversampled receiver architecture and detection of interference in IF bands devoid of target reflections. Such an approach significantly improves interference detection sensitivity and can enable robust interference mitigation.