CDM Based Virtual FMCW MIMO Radar Imaging at 79 GHz

Hamidi, Shahrokh; Naeini, Safieddin Safavi

doi:10.1109/ccece53047.2021.9569039

Cited by 4 publications

(3 citation statements)

References 6 publications

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“…Then, to extract only real targets from the range-Doppler map where the ghost and real targets exist at the same time, a method of subtracting the two signals is proposed. In other words, by using the signals of (10) and (11), only desired target information can be extracted, which can be expressed as…”

Section: B Extraction Of Actual Targetsmentioning

confidence: 99%

“…To estimate the distance, velocity, and angle information of a target using the MIMO FMCW radar system, signals transmitted from each antenna element must be distinguished at the receiving end [5]. Therefore, the antenna system adopts a time-division multiplexing (TDM) [6], [7], a frequency-division multiplexing [8], [9], or a code-division multiplexing [10], [11] to transmit FMCW radar signals. Currently, the TDM-based MIMO scheme is most commonly used, but it has a disadvantage in that the maximum detectable velocity is reduced in proportion to the number of transmit antenna elements [12].…”

Section: Introductionmentioning

confidence: 99%

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Solving Ambiguity in Target Detection for BPSK-Based MIMO FMCW Radar System

2023

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In a binary phase shift keying (BPSK)-based multiple-input and multiple-output (MIMO) frequency-modulated continuous wave (FMCW) radar system, real and ghost targets are detected simultaneously, causing ambiguity in target detection. In this paper, we define the targets that are inevitably generated by the BPSK modulation as ghost targets and propose a method for suppressing them. The proposed ghost target suppression method consists of two main steps. First, at the receiving end, a received signal is demodulated using a specific code orthogonal to binary codes used to modulate transmitted signals.With the orthogonality between the codes, only ghost targets remain in the demodulated received signal. Then, by subtracting the demodulated signal including the ghost targets from the initially received signal, only the information of the actual targets can be restored. We verify the performance of the proposed method through simulations and actual signal measurements. In addition, the target estimation performance of the proposed method is compared with that of the time-division multiplexing MIMO FMCW radar system.INDEX TERMS Binary phase shift keying, frequency-modulated continuous wave, ghost target, multipleinput and multiple-output.

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Section: B Extraction Of Actual Targetsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Solving Ambiguity in Target Detection for BPSK-Based MIMO FMCW Radar System

2023

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“…As a solution to the forementioned issues, the multi-input multi-output (MIMO) antenna array with various multiplexing schemes can be applied to chirp units [11]. Various multiplexing schemes for the MIMO radar, such as timedivision multiplexing (TDM) [12], [13], code-division multiplexing (CDM) [14], [15], and frequency division multiplexing (FDM) [16], ensure orthogonality between Tx signals so that they can be separated in each Rx signal. Consequently, the MIMO antenna array with N Tx Tx antenna elements and N Rx Rx antenna elements can be configured to a virtual antenna array with a single Tx antenna element and N Tx N Rx virtual Rx antenna elements.…”

Section: Introductionmentioning

confidence: 99%

Novel Multiplexing Scheme for Resolving the Velocity Ambiguity Problem in MIMO FMCW Radar Using MPSK Code

et al. 2022

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For the high-resolution DoA (Direction of Arrival) estimation, various multiplexing schemes are considered for the multi-input multi-output (MIMO) fast chirp frequency-modulated continuous-wave (FMCW) radar. However, current schemes such as time-division multiplexing (TDM) and binary-phase modulation (BPM) may reduce the maximum detectable velocity, which causes the velocity ambiguity problem. As an extension of the BPM scheme to mitigate this issue, we propose a novel multiplexing scheme using M phase-shift keying (MPSK) code which duplicates shifted target peaks at unequal intervals over the velocity domain. The proposed scheme finds the true peaks to resolve the velocity ambiguity problem by the inversion of the circulant matrix with low additional computation. In addition, the successful implementation of the proposed scheme is conducted with 4 by 8 MIMO uniform linear array (ULA) antennas through the state-of-the-art FMCW radar. Finally, the proposed scheme is compared to the conventional TDM based MIMO scheme regarding signal to noise ratio (SNR) and phase calibration issues for moving targets. The proposed scheme is to estimate the accurate 4D information of targets while resolving the velocity ambiguity problem in the MIMO FMCW radar systems.

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3D Near-Field Virtual MIMO-SAR Imaging Using FMCW Radar Systems at 77 GHz

Hamidi

2024

2024 IEEE Canadian Conference on Electrical and Computer Engineering (CCECE)

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CDM Based Virtual FMCW MIMO Radar Imaging at 79 GHz

Cited by 4 publications

References 6 publications

Solving Ambiguity in Target Detection for BPSK-Based MIMO FMCW Radar System

Solving Ambiguity in Target Detection for BPSK-Based MIMO FMCW Radar System

Novel Multiplexing Scheme for Resolving the Velocity Ambiguity Problem in MIMO FMCW Radar Using MPSK Code

3D Near-Field Virtual MIMO-SAR Imaging Using FMCW Radar Systems at 77 GHz

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