A Multi-Carrier-Frequency Random-Transmission Chirp Sequence for TDM MIMO Automotive Radar

Hu, Xueyao; Li, Yang; Lu, Man; Wang, Yanhua; Yang, Xiaopeng

doi:10.1109/tvt.2019.2900357

Cited by 47 publications

(20 citation statements)

References 33 publications

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“…The simulation parameters are set as follows, carrier frequency f 0 = 77 GHz, bandwidth B = 1 GHz and the corresponding range resolution Δ R = 0.15 m, therefore the range error is 0.075 m. In the simulation, a phased array with N = 8 antennas is used, and the practical radar system is a time‐division MIMO radar [8] including two transmitters and four receivers, which can generate 8 virtual antennas. The practical radar system and testing scenario are shown in Figs.…”

Section: Simulation Resultsmentioning

confidence: 99%

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Approach of 2D direction of arrival estimation of FMCW traffic radar by utilising 1D array

Zhang

et al. 2020

Electron. lett.

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The frequency-modulated continuous wave (FMCW) radar will play a more important role in future intelligent traffic systems due to low cost and high adaptability to complex environments. Generally, a 2D array is utilised to measure range, speed and azimuth and elevation angles (4D) for multiple vehicles simultaneously. However, a traffic radar utilising a 2D array will enhance its system complexity; therefore, the increased cost would make it less superior to LiDAR. In this Letter, an azimuth and elevation angles estimation method of FMCW radar utilising only 1D array is proposed. Thus, it can provide 4D parameters to multiple vehicles simultaneously. The feasibility of the proposed approach is verified by on-road measurement data.

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Section: Simulation Resultsmentioning

confidence: 99%

“…The azimuth angle can be estimated bŷ In the simulation, a phased array with N = 8 antennas is used, and the practical radar system is a time-division MIMO radar [8] including two transmitters and four receivers, which can generate 8 virtual antennas. The practical radar system and testing scenario are shown in Figs.…”

mentioning

confidence: 99%

Approach of 2D direction of arrival estimation of FMCW traffic radar by utilising 1D array

Zhang

et al. 2020

Electron. lett.

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“…As the number of transmitter (TX) components increases, it becomes more difficult to maintain orthogonality. To this end, time division multiplexing (TDM) [3]- [5], [14]- [16], frequency division multiplexing (FDM) [10], [17]- [19], and code division multiplexing (CDM) [20]- [22] have been applied to MIMO radars. Regarding the TDM method, because only one TX out of multiple TX paths transmits a signal at a particular time, this multiplexing method suffers from a loss of processing gain with respect to the number of TX antennas.…”

Section: Introductionmentioning

confidence: 99%

“…Regarding the TDM method, because only one TX out of multiple TX paths transmits a signal at a particular time, this multiplexing method suffers from a loss of processing gain with respect to the number of TX antennas. Even though there is no bandwidth loss, both the motioninduced error problem [15]- [16], and the Doppler ambiguity limit can arise. In the case of FDM, because all TX paths operate simultaneously, there is no issue about Doppler ambiguity limit as increasing the number of TX antennas.…”

Section: Introductionmentioning

confidence: 99%

Time-and-Frequency Hybrid Multiplexing for Flexible Ambiguity Controls of DFT-coded MIMO OFDM Radar

Suh

Lee²,

Gil

et al. 2021

IEEE Access

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A time-and-frequency hybrid multiplexing technique for a multiple-input multiple-output (MIMO) orthogonal frequency-division multiplexing (OFDM) radar is proposed. Discrete Fourier transform (DFT)-coded OFDM waveforms are introduced, which allow it to be free from range-dependent angle errors. These are readily used to provide both time-domain and frequency-domain multiplexings in the MIMO OFDM radar. The DFT-coded frequency-domain multiplexing shortens the maximum unambiguous range, while the DFT-coded time-domain multiplexing lowers the maximum Doppler ambiguity. A hybrid of both domain multiplexing techniques can mitigate the respective limitations by adaptively selecting the proper DFT matrix size in each multiplexing domain. This allows to solve the intrinsic range and Doppler ambiguity problems of MIMO radars by controlling the hybrid ratio of the two kinds of DFT-code based multiplexing methods. Range-Doppler and range-angle maps of four examples with different hybrid multiplexing ratios are simulated with a MIMO OFDM radar numerical platform.INDEX TERMS Discrete Fourier transform (DFT) code, hybrid multiplexing, multiple-input multipleoutput (MIMO) radar, orthogonal frequency-division multiplexing (OFDM) radar, range and Doppler ambiguities.

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“…On the other hand, some new radar system architectures and waveforms are proposed to benefit the interference mitigation [4]- [10]. The frequency-hopping random chirp (FHRC) FMCW technique [4], [5] and FMCW radar with random repetition interval [6] resets the parameters of the chirp signals (the bandwidth, sweep duration, center frequency, repetition interval) every cycle to result in noise-like frequency responses of mutual interferences after the received signals are downconverted and demodulated. Both techniques would mitigate partial interferences and avoid the appearance of ghost targets caused by mutual interferences.…”

Section: Introductionmentioning

confidence: 99%

CFAR-Based Interference Mitigation for FMCW Automotive Radar Systems

Wang¹

2021

Preprint

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In this paper, constant false alarm rate (CFAR) detector-based approaches are proposed for interference mitigation of Frequency modulated continuous wave (FMCW) radars. The proposed methods exploit the fact that after dechirping and low-pass filtering operations the targets' beat signals of FMCW radars are composed of exponential sinusoidal components while interferences exhibit short chirp waves within a sweep. The spectra of interferences in the time-frequency (t-f ) domain are detected by employing a 1-D CFAR detector along each frequency bin and then the detected map is dilated as a mask for interference suppression. They are applicable to the scenarios in the presence of multiple interferences. Compared to the existing methods, the proposed methods reduce the power loss of useful signals and are very computationally efficient. Their interference mitigation performances are demonstrated through both numerical simulations and experimental results.

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A Multi-Carrier-Frequency Random-Transmission Chirp Sequence for TDM MIMO Automotive Radar

Cited by 47 publications

References 33 publications

Approach of 2D direction of arrival estimation of FMCW traffic radar by utilising 1D array

Approach of 2D direction of arrival estimation of FMCW traffic radar by utilising 1D array

Time-and-Frequency Hybrid Multiplexing for Flexible Ambiguity Controls of DFT-coded MIMO OFDM Radar

CFAR-Based Interference Mitigation for FMCW Automotive Radar Systems

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