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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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Non-Uniform mimo array Design for Radar Systems Using Multi-Channel Transceivers

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REMOTE SENSING 2023年第1期15卷 78-78页

作者： Kim, Eunhee Kim, Ilkyu Kim, Wansik Sejong Univ Dept Def Syst Engn 209 Neungdong Ro Seoul 05006 South Korea Sejong Cyber Univ Elect & Elect Engn Dept 121 Gunja Ro Seoul 05000 South Korea LIGNex1 Co 207 Mabuk Ro Yongin 16911 South Korea

Multiple-input multiple-output (mimo) technology has recently attracted attention with regard to improving the angular resolution of small antennas such as automotive radars. If appropriately placed, the co-located transmit and receive arrays can make a large virtual aperture. This paper proposes a new method for designing arrays by adopting a structure with minimum redundancy. The proposed structure can significantly increase the virtual array aperture while keeping the transmit and receive antennas at the same size. We describe the application of the proposed method to subarray-type antennas using multi-channel transceivers, which is essential for arranging RF hardware in a small antenna operating at high frequency. Further, we present an analysis of the final beam pattern and discuss its benefits and limitations.

关键词： mimo array minimum redundancy array virtual array antenna subarray

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UWB Millimeter-wave 1D mimo array for Non-destructive Testing 15

UWB Millimeter-wave 1D MIMO Array for Non-destructive Testin...

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15th European Conference on Antennas and Propagation (EuCAP)

作者： Tolin, Enrico Campo, Marta Arias Cetinkaya, Harun Herschel, Reinhold Guetgemann, Sabine Krebs, Christian Bruni, Simona IMST GmbH Kamp Lintfort Nordrhein Westf Germany Fraunhofer Inst Hochfrequenzphys & Radartech Wachtberg Nordrhein Westf Germany

ISBN: (纸本)9788831299022

A sparse, UWB, multi-module 1D mimo array at D-band (110-160 GHz) is proposed for 2D imaging of hot steel slabs during the hot rolling process in steelworks. The mimo array consists of 22 transmitting and 175 receiving antennas. Results illustrate that the mimo array provides significantly low level of side lobes and high resolution capability. Besides the mimo concept and first simulations, this paper describes the wide band antenna concept which will be integrated in the system. Full-wave simulation results for the antenna show 37% bandwidth with more than 85% radiation efficiency, and stable -3 dB beamwidth over the whole frequency band.

关键词： mimo array millimter-wave ultra-wideband

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Miniaturized Broadband Dual-Polarized mimo Antenna array With Stable Radiation Pattern for Base-Station Application

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IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION 2023年第8期71卷 6688-6697页

作者： Ye, Liang Hua Chen, Gui Run Shi, Xinrong Wu, Rui Li, Jian-Feng Zhang, Xiu Yin Guangdong Univ Technol Sch Phys & Optoelect Engn Guangzhou 510006 Peoples R China Guangdong Univ Technol Sch Electromech Engn State Key Lab Precis Elect Mfg Technol & Equipment Guangzhou 510006 Peoples R China Guangdong Inst Metrol Guangdong Prov Key Lab Modern Geometr & Mech Metro Guangzhou 510405 Peoples R China Guangdong Univ Technol Sch Integrated Circuits Guangzhou 510006 Peoples R China South China Univ Technol Sch Elect & Informat Engn Guangzhou 510641 Peoples R China

A wideband dual-polarized mimo antenna array having small size and stable radiation performance for base station applications is introduced. The antenna element, which is formed by four folded dipole antennas arranged in a small square aperture, is introduced to obtain excellent impedance matching and steady radiation pattern within a broad bandwidth of 36.7% (0.69-1 GHz) with low profile. Based on the high-performance element, a compact broadband dual-polarized mimo array for mobile communications is then designed. To stabilize the radiation pattern of the mimo array, a new method of element-shared scheme and 90 degrees phase compensation is introduced to design the mimo array to obtain stable half power beamwidth (HPBW) of around 64 degrees for desired 120 degrees sector coverage of cellular mobile communications. A special feed network with good performance is designed to excite the mimo array. The mimo array introduces a broad bandwidth of 43.7% (0.68-1.06 GHz) for reflection coefficient <-15 dB, as well as good isolation of more than 25 dB between all the ports. Steady radiation pattern with an HPBW of 64 +/- 7 degrees and low sidelobe level of below -15 dB is observed, which is desirable for modern mobile communications.

关键词： Base station antenna dual-polarized antenna array mimo array stable radiation pattern

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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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Novel Techniques Applied to mimo Antenna array for 5G Sub-7 GHz Smartphone Applications

Novel Techniques Applied to MIMO Antenna Array for 5G Sub-7 ...

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International Workshop on Antenna Technology (iWAT)

作者： Sim, Chow-Yen-Desmond Feng Chia Univ Org Dept Elect Engn Taichung Taiwan

ISBN: (纸本)9798350334081

As many modern cities have recently embraced the 5G communication system, its related antenna designs for smartphones operating in the 5G New Radio (NR) band (n77/n78/n79) are vital to the 5G user experience. In this Invited Talk, dualband/multiband and wideband 5G antenna designs with mimo array technology that can cover the entire 5G NR band n77/n78/n79 (3300-5000 MHz) are initially introduced. To further fulfill the new 5G specifications NR-U (New Radio Unlicensed) Band n46 (5150-5925 MHz) and n96 (5925-7125 MHz), various novel mimo array antenna design techniques for achieving the entire Sub-7 GHz are uncovered with detailed diagrams to reveal the logic behind each design technique.

关键词： 5G NR Band mimo array 5G smartphone Sub-7 GHz 5G antenna designs

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High Isolation Wideband SICL Excited Compact mimo Antenna array for 5G Endfire Applications in Customer Premises Equipment 16

High Isolation Wideband SICL Excited Compact MIMO Antenna Ar...

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16th European Conference on Antennas and Propagation (EuCAP)

作者： Baghel, Naman Mukherjee, Soumava Indian Inst Technol Jodhpur Dept Elect Engn Jodhpur Rajasthan India

ISBN: (纸本)9788831299046

This paper presents Substrate Integrated Coaxial Line (SICL) fed wideband Multiple-Input Multiple-Output (mimo) antenna array for 5G endfire applications. The radiating element in the array is a modified half-wavelength dipole antenna formed by tilted dipoles at +/- 45. to avoid overlapping between successive element in the array configuration. One arm is placed on the top while the other arm is placed on the bottom substrate and are respectively fed by top and middle plate (using a feeding via) of SICL line. The out of phase surface current of SICL feed line is utilized to successfully excite the dipole antenna. The top-bottom arrangement of the arms of the dipole antenna enables further compactness in the dimension of the array. SICL technology adds another advantage by reducing the coupling in the other port when one port is excited thereby high isolation is achieved using SICL. A four element mimo antenna array for 360. azimuth coverage is proposed to exhibit a gain of 6 dBi with wide impedance bandwidth of 5.6 GHz and cross-polarization level below 13.6 dB at 28 GHz. The proposed mimo antenna array is a potential candidate for 5G endfire applications in customer premises equipments (CPEs).

关键词： 5G antennas isolation millimeter wave 5G mimo mimo array SICL

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A Fast 3D Near Range Imaging Algorithm for a Scanning Sparse mimo array in the Millimeter Band

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SENSORS 2020年第17期20卷 4701页

作者： Wang, Feifan Deng, Bin Yang, Qi Wang, Hongqiang Zhang, Ye Natl Univ Def Technol Coll Elect Sci & Technol Changsha 410073 Peoples R China

Millimeter-wave technology has been widely used in near range targets imaging scenarios, such as mechanical scanning and multiple input multiple output (mimo) array imaging. Emerging scanning array regimes increase the need for fast-speed and high-quality imaging techniques, which, however, are often subject to specific array positions. Moreover, the relationship between array positions and the imaging performance is not clear, which leads to no uniform standard for array design. In this paper, a series of array configurations are designed to explore the impact of different array positions on the cross-range imaging performance. Meanwhile, a novel fast fully focused imaging algorithm with wavenumber domain properties is presented, which is not constrained by the positions of the transmitters and receivers. Simulation and experimental results show that, compared with a conventional algorithm, the proposed algorithm has a faster imaging speed under the same imagining quality. This study provides a feasible method for fast fully focused imaging in the case of location-constrained mimo arrays, or partially damaged transceivers.

关键词： mimo array near range imaging range migration algorithm synthetic aperture techniques three-dimensional imaging

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

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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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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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