Spatial-Domain Mutual Interference Mitigation for Slow-Time MIMO-FMCW Automotive Radar


This paper considers mutual interference mitigation among automotive radars using frequency modulated continuous wave (FMCW) for the signaling scheme and multiple-input multiple-output (MIMO) for achieving a virtual array. For the first time, we derive a general interference signal model that fully accounts for not only the time-frequency incoherence, but also the slow-time code incoherence. Together with a standard MIMO-FMCW object signal model, we formulate the interference mitigation as a spatial-domain detection problem and propose a generalized likelihood ratio test (GLRT) detector. Moreover, we derive the exact theoretical performance of the proposed GLRT detector, proving that it is a constant false alarm rate (CFAR) detector against MIMO-FMCW mutual interference. Preliminary numerical results confirm the performance of our proposed detector and show advantages to baseline detectors.