OFDM Chirp Waveform Diversity Design With Correlation Interference Suppression for MIMO Radar

• Published in: IEEE geoscience and remote sensing letters Vol. 14; no. 7; pp. 1032 - 1036
• Main Authors: Li, Hui, Zhao, Yongbo, Cheng, Zengfei, Feng, Dazheng
• Format: Journal Article
• Language: English
• Published: Piscataway IEEE 01.07.2017; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Bandwidth; Bandwidths; Chirp; Correlation; Correlation analysis; Correlation interference; Detection; Interference; Methods; MIMO radar; multiple-input multiple-output (MIMO) radar; Orthogonal Frequency Division Multiplexing; orthogonal frequency-division multiplexing (OFDM) chirp waveform; Peak to average power ratio; Radar; Sidelobes; Simulation; waveform diversity; Waveforms
• ISSN: 1545-598X; 1558-0571
• DOI: 10.1109/LGRS.2017.2693681

The orthogonal frequency-division multiplexing (OFDM) chirp waveform has attracted much attention due to its high range resolution, low peak-to-average ratio, and large time-bandwidth product. In its application to multiple-input multiple-output radar, the correlation property of multiple OFDM chirp waveforms should be considered primarily for good detection performance. The simulation results show that high sidelobes exist in correlation functions of the conventional waveforms. In this letter, the reason for high correlation sidelobes is explored first, which is the equal subchirp durations and the same subcarrier bandwidth. Second, two new OFDM chirp waveform diversity design schemes are proposed to suppress the correlation interference. Via designing the various subchirp durations or subcarrier bandwidths specially, the high sidelobes are depressed and the correlation property is improved. Both simulation results and comparisons verify the effectiveness of the proposed methods.