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Open AccessArticle

OFDM Chirp Waveform Design Based on Subchirp Bandwidth Overlap and Segmented Transmitting for Low Correlation Interference in MIMO Radar

School of Physics and Optoelectronic Engineering, Xidian University, Xi’an 710071, China
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Sensors 2019, 19(12), 2696; https://doi.org/10.3390/s19122696
Received: 24 April 2019 / Revised: 6 June 2019 / Accepted: 12 June 2019 / Published: 14 June 2019
(This article belongs to the Special Issue Radar and Radiometric Sensors and Sensing)
There are some special merits for the orthogonal frequency division multiplexing (OFDM) chirp waveform as multiple input multiple output (MIMO) signals. This signal has high range resolution, good Doppler tolerance, and constant modulus superiority since it exploits a full bandwidth and is based on chirp signals. The correlation sidelobe peaks level are critical for the detection requirement of MIMO radar signals, however conventional OFDM chirp signals produce high autocorrelation sidelobe peaks (ASP) and cross-correlation peaks (CP), which reduces detection performance. In this paper, we explore the structure of OFDM chirp signals’ autocorrelation function and proposed a scheme to reduce the designed signal’s ASP by a designing suitable range of subchirp bandwidth and a segmented transmit-receive mode. Next, we explore a suitable range of interval between the chirp rates of each two signals to reduce the CP. The simulation of designed signals verifies the effectiveness of the proposed methods in the reduction of ASP and CP, with the correlation performance being compared with recent relate studies. In addition, the multiple signals detection and one-dimensional range image simulation show the good detection performance of a designed signal in MIMO radar detection. View Full-Text
Keywords: time-frequency structure; autocorrelation sidelobe interference; cross-correlation interference; orthogonal frequency-division multiplexing (OFDM) chirp waveform; multiple-input multiple-output (MIMO) radar time-frequency structure; autocorrelation sidelobe interference; cross-correlation interference; orthogonal frequency-division multiplexing (OFDM) chirp waveform; multiple-input multiple-output (MIMO) radar
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Lan, X.; Zhang, M.; Li, J.-X. OFDM Chirp Waveform Design Based on Subchirp Bandwidth Overlap and Segmented Transmitting for Low Correlation Interference in MIMO Radar. Sensors 2019, 19, 2696.

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