Mutual Interference of Automotive OFDM Radars—Analysis and Countermeasures

Due to its noise-like signal property, digital orthogonal frequency-division multiplexing (OFDM) radars are often assumed be robust against interference. While a lot of research has been carried out for interference between different modulation schemes, the mechanisms from OFDM have barely addressed. This paper provides thorough analysis mutual based on radar measurements using 4x4 77 GHz multiple-input multiple-output (MIMO) prototype. The effects described both qualitatively and quantitatively cyclic-prefix stepped-carrier OFDM. Second, it is shown that conventional mitigation methods in spectrogram not suitable due random coding As an alternative, application adaptive beamforming proposed two realization possibilities provided. Finally, new strategies domain proposed. They allow shape specific range-Doppler cells, yielding interference-free range-velocity map area interest. Additionally, method may used as basis enable simple strategies.