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mimo array for short-range, high-resolution automotive sensing

IET RADAR SONAR AND NAVIGATION 2018年第10期12卷 1165-1171页

作者： Sayin, Alp Pooni, Sukhjit Hoare, Edward Antoniou, Michael Univ Birmingham Dept Elect Elect & Syst Engn Birmingham W Midlands England

The study introduces the concept of multiple input-multiple output (mimo) radar or sonar arrays for short-range, high-resolution sensing in vehicular applications. The use of a mimo architecture, which is becoming increasingly popular in this field, is selected to reduce the amount of physical elements in the array needed for beamforming, but also to allow signal processing approaches for forming narrow beams in the near-field of the array. The study analytically derives the proposed signal processing approach, and then verifies it via simulated and experimental data in a laboratory environment with scientific equipment assembled for this purpose.

关键词： array signal processing sonar arrays mimo radar radar signal processing sonar signal processing road vehicle radar mimo array high-resolution automotive sensing high-resolution sensing vehicular applications mimo architecture signal processing approach narrow beams multiple input multiple output radar array multiple input multiple output sonar arrays

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Efficient Joint Estimation of DOA, Range and Reflectivity in Near-Field by Using Mixed-Order Statistics and a Symmetric mimo array

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IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY 2022年第3期71卷 2824-2842页

作者： Molaei, Amir Masoud del Hougne, Philipp Fusco, Vincent Yurduseven, Okan Queens Univ Belfast Inst Elect Commun & Informat Technol Belfast BT3 9DT Antrim North Ireland Univ Rennes CNRS UMR 6164 IETR F-35000 Rennes France

Most works in the literature on parameter estimation with multiple-input multiple-output (mimo) systems are limited to estimating only the direction of arrival (DOA), and/or based on the far-field assumption. However, the joint estimation of DOA and range is an important challenge for near-field (NF) applications. In addition, backscatter coefficient estimation, as one of the most important parameters of radar systems, has been neglected in existing works. In this paper, the joint estimation of the DOA, range and reflectivity is presented for a mimo array in the NF. By employing the symmetry property in the array, first, two special spatial expressions based on fourth-order and second-order statistics from the received data are defined so that the output of the first expression lacks targets' range information. By collecting the information of all the sensors and calculating all the interactions between the transmit and receive sensors based on the first expression, a spatial cumulant matrix is constructed. In two different approaches, with/without the use of eigendecomposition, the virtual steering vectors are extracted. Next, DOAs are estimated by a one-dimensional (1D) spectral search. The second expression, which contains both angle and range information, is used to construct several covariance submatrices and then to construct a covariance matrix with a size corresponding to the array's dimensions. Then, corresponding ranges are estimated by employing estimated DOAs, eigendecomposition and 1D spectral searches. Finally, the equations required to estimate the reflectivity are derived. The simulation results show the remarkable performance of the proposed method in terms of computational time and estimation accuracy.

关键词： Direction-of-arrival estimation Estimation Reflectivity mimo communication Radar Radar antennas Antenna arrays DOA-range-reflectivity estimation mimo array MOSA near-field

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Millimeter-Wave mimo array Based on Semi-Circular Topology

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IEEE SENSORS JOURNAL 2020年第14期20卷 7740-7749页

作者： Cetinkaya, Harun Kueppers, Simon Herschel, Reinhold Pohl, Nils Fraunhofer Inst High Frequency Phys & Radar Tech D-53343 Wachtberg Germany Ruhr Univ Bochum Dept Integrated Syst D-44801 Bochum Germany

A novel generic two dimensional (2D) sparse multiple-input-multiple (mimo) topology is proposed. Based on this topology, a real-time, compact demonstrator is realized at millimeter-wave range with narrow frequency band. It shows that the topology reduces hardware effort. Theoretical and experimental studies of focusing characteristics of the demonstrator are performed. These studies demonstrate that the proposed topology provides comparable focusing capabilities to another novel topology such as curvilinear configuration. Imaging capability of the proposed array is experimentally demonstrated. It is shown that the demonstrator is favorable to be employed on mobile platforms for fast and accurate imaging.

关键词： Antenna arrays mimo communication Topology Focusing Apertures Radar imaging Firefighting FMCW millimeter-wave mimo array near-field novel topology real-time measurement sparse array 3D imaging

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Human Identification Using mimo array

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IEEE SENSORS JOURNAL 2018年第8期18卷 3183-3189页

作者： Sasakawa, Dai Honma, Naoki Nakayama, Takeshi Iizuka, Shoichi Iwate Univ Grad Sch Engn Morioka Iwate 0208551 Japan Panasonic Corp Home Appliances Dev Ctr Kadoma Osaka 5718501 Japan

This paper proposes a method of using a microwave multiple-input multiple-output (mimo) array to recognize different people;it allows smart home applications to dispense with contact and wearable devices. This method captures and processes the time-variant channel generated by a human body present within the field of an mimo antenna. The time-variant channel is measured, and the spatial and temporal correlation is used for identification by comparing the captured data to reference data. The proposed method identifies the subject as the registrant with maximum correlation. Experiments involving eight known subjects and four imposters demonstrate that the proposed method offers accurate identification with no false positives. The results show that an 8 x 8 array can achieve the equal error rate of 0% when the number of identification channels is five and above.

关键词： Human identification microwave mimo array narrowband

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Joint DOD and DOA Estimation for mimo array With Velocity Receive Sensors

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IEEE SIGNAL PROCESSING LETTERS 2011年第7期18卷 399-402页

作者： He, Jin Swamy, M. N. S. Ahmad, M. Omair Concordia Univ Dept Elect & Comp Engn Ctr Commun & Signal Proc Montreal PQ H3G 1M8 Canada

This letter investigates the problem of joint estimation of the direction of departure (DOD) and the direction of arrival (DOA) for multi-input multi-output (mimo) array systems. A new bistatic mimo array system, configured with multiple transmit sensors and multiple velocity receive sensors is introduced, and a new joint DOD and DOA estimation algorithm is proposed. The key idea behind the proposed algorithm is to use the DOA information embedded in the velocity sensors to start 1-D MUSIC searches for the DOD and DOA in succession. The proposed successive MUSIC algorithm is suitable for irregular array geometry, imposes less constraint on the receive sensor spacing, and requires no parameter pairing nor two-dimensional searching.

关键词： DOA estimation DOD estimation mimo array velocity sensors

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mimo array Imaging for Ultrasonic Nondestructive Testing

MIMO Array Imaging for Ultrasonic Nondestructive Testing

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Conference on Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security

作者： Demirli, Ramazan Rivenq, Xavier Zhang, Yimin D. Ioana, Cornel Amin, Moeness G. Villanova Univ Ctr Adv Commun 800 E Lancaster Ave Villanova PA 19085 USA Inst Natl Polytech Grenoble Signal & Image Proc Lab Grenoble France

ISBN: (纸本)9780819485458

Ultrasonic sensor arrays continue to be broadly applied for nondestructive material testing. Generally, conventional beamforming techniques have been the favorite approach to generate images from the sensor array data. In this paper, we examine the use of multiple-input multiple-output (mimo) ultrasonic processing technique for imaging internal structures of materials. The goal is to identify and locate potential defects and anomalies. The imaging technique is comprised of excitation of transmitting sensors with sequential or orthogonal wideband signals, matched filtering, and adaptive weighting. The weighting of the signals at the receiver takes into account the transducer ultrasound radiation patterns. The mimo technique is particularly attractive for ultrasonic imaging, as the different bistatic combinations of transmit and receive sensor pairs allows effective and simple formations of virtual arrays with extended apertures and denser spatial sampling. As such, high-resolution images can be generated with fewer or available transducers. The performance of this technique is experimentally examined using test specimens with artificially drilled small size flat bottom holes that simulate defects. One-dimensional and two-dimensional array configurations are used to form desired virtual arrays and their respective imaging capabilities are evaluated and compared.

关键词： mimo array beamforming virtual array ultrasonic imaging nondestructive testing

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Spectral Domain Filling and 3D SAR Imaging of Airborne mimo array

Spectral Domain Filling and 3D SAR Imaging of Airborne MIMO ...

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IEEE International Conference of Region 10 (TENCON)

作者： Wu Zibin Zhu Yutao Su Yi Natl Univ Def Technol Sch Elect Sci & Engn Changsha Hunan Peoples R China

ISBN: (纸本)9781479928255;9781479928279

Profited from the unique advantages, airborne mimo (Multiple Input Multiple Output) array 3D SAR technique has become a field of intensive research in recent years. By utilizing mimo array on the fuselage and wings, a radar system can obtain a high resolution in cross track direction, comparable to the resolution in along track direction and height direction. Meanwhile, those imaging algorithms which were proposed for uniformly-spaced sampling are restricted badly to specific mimo array configurations. For this reason, a 3D imaging algorithm based on spectral domain filling is presented for airborne mimo array SAR, which can mitigate the spatial sampling model restriction of uniformly-space sampling based imaging algorithms.

关键词： 3D SAR mimo array spectral domain imaging

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Direction of Arrival Estimation Using Compact mimo array for Portbale Devices

Direction of Arrival Estimation Using Compact MIMO Array for...

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International Symposium of IEEE-Antennas-and-Propagation-Society / USNC/URSI National Radio Science Meeting

作者： Sun, Sining Li, Hui Xiong, Jiang Dalian Univ Technol Dept Informat & Commun Engn Dalian Peoples R China Univ Elect Sci & Technol China Computat Electromagnet Lab Chengdu Sichuan Peoples R China

ISBN: (纸本)9781538632840

Accurate direction of arrival (DOA) estimation attracts more intention for smart devices in wireless communication. However, designing compact antenna array for estimation with high accuracy is challenging. In this work, a closely packed mimo array is particularly designed for proper amplitude ratio over different angles. Combining with the phase information, the accuracy and robustness of the estimation is improved, with phase ambiguity eliminated as well. Simulation results show that the proposed mimo array obtains a maximum and averaged RMS error of 2 degrees and less than 1 degree, respectively, over the entire azimuth plane with an SNR of 10 dB. It performs well at both high and low SNR scenarios, and can be easily integrated in devices such as Wi-Fi router.

关键词： Compact antenna direction of arrival (DOA) estimation direction finding multiple signal classification(MuSiC) mimo array

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Optimum L/C-Based Practical Matching for the Maximum Wideband Channel Capacity of a Compact mimo array

Optimum L/C-Based Practical Matching for the Maximum Wideban...

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2010 IEEE International Symposium Antennas and Propagation/CNC-USNC/URSI Radio Science Meeting

作者： Ogawa, Koichi Hayashi, Toshiteru Yamamoto, Atsushi Panason Corp 1006 Kadoma Osaka 5718501 Japan Panason Mobile Commun Co Ltd Yokosuka Kanagawa 2390841 Japan

ISBN: (纸本)9781424449682

The use of a mimo array in a small handset often affects system performance due to mutual coupling between the elements. This has motivated many researchers to conduct extensive studies on the effects of mutual coupling, and to optimize the impedance matching conditions to increase the channel capacity. However, there has been little study on enhancing channel capacity using a practical impedance matching circuit that can be used in a mimo array installed in a commercial handset. In addition, in studying the matching circuit, we must consider the wideband characteristics since the plan for future cellular systems is that they are to be allocated a very wide frequency band, such as the LTE-advanced system. This paper studies the impact of a matching circuit of a dipole array constructed from practical L/Cbased circuit components on channel capacity over a wide frequency band.

关键词： L/C-based practical matching LTE-advanced system mimo array mimo communication cellular radio cellular systems channel capacity dipole antenna arrays dipole array impedance matching impedance matching matching circuit mobile handsets mutual coupling wideband channel capacity

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Study on Sparse mimo array for Compressive Sensing Imaging

Study on Sparse MIMO Array for Compressive Sensing Imaging

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IEEE Conference on Antenna Measurements & Applications (CAMA)

作者： Cheng, Qiao Hao, Yang Queen Mary Univ London Sch Elect Engn & Comp Sci London England

ISBN: (纸本)9781538657959

This paper discusses Compressive Sensing (CS) imaging based on different multiple-input multiple-output (mimo) arrays. As the system responses matrix is related to the array geometry, the topology of a mimo array has a huge impact in CS reconstruction. Numerical simulations demonstrate that the curvilinear array achieves better reconstruction than the Mills Cross array and uniform rectilinear array. Moreover, the traditional point spread function (PSF) is more suitable than the CS PSF for evaluating the performance of a CS imaging system.

关键词： Compressive Sensing mimo array radar imaging sparse array

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