A novel narrowband interference suppression method for OFDM radar

The interference between automotive radar sensors becomes a major issue with the increasing number of radars integrated in vehicles for comfort and safety functions. The state-of-the-art radars, typically operating with frequency modulated continuous wave (FMCW) modulation, can be regarded as narrowband interferers for a high bandwidth orthogonal frequency division multiplexing (OFDM) radar with comparably short duration of OFDM symbols. In this paper, we analyze the impact of such interferers on OFDM radar, give a signal model of OFDM radar in presence of interference and discuss the effect of signal processing steps on the latter. Additionally, we present an interference suppression algorithm suitable for any type of narrowband interference. We show in simulations that a considerable interference suppression can be achieved and verify the presented algorithm with measurements.