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A Doppler-Tolerant Stepped-Carrier OFDM-Radar Scheme Based on All-Cell-Doppler-Correction

Recent publications show that major limitations of orthogonal frequency-division multiplexing (OFDM) as modulation format for automotive radars are solved. These include the requirements on analog-to-digital and digital-to-analog converters whose required sampling rate can be reduced using a stepped-carrier OFDM-scheme as well as the all-cell-Doppler-correction-based approach that counteracts the loss of orthogonality due to the Doppler shift. However, so far, the application of both methods is exclusive to each other. In this paper, a combined evaluation scheme is presented that allows to use a stepped-carrier scheme in combination with a quasi repeated-symbol OFDM-waveform and includes the Doppler-correction into the DFT for velocity estimation. This yields a high resolution radar image in both range and velocity at low sampling rate with significantly increased signal-to-noise ratio (SNR) as the orthogonality of subcarriers is preserved. The scheme is verified with simulations that demonstrate its benefits.