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Direction-of-Arrival Estimation With circular array Using Compressed Sensing in 20 GHz Band

IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS 2021年第5期20卷 703-707页

作者： Uemura, Saki Nishimori, Kentaro Taniguchi, Ryotaro Inomata, Minoru Kitao, Koshiro Imai, Tetsuro Suyama, Satoshi Ishikawa, Hironori Oda, Yasuhiro Niigata Univ Niigata 9502181 Japan NTT Docomo Inc Tokyo 1006150 Japan

The super-high-frequency band is used in the fifth-generation (5G) mobile communication system, and the introduction of massive multiple-input-multiple-output (MIMO) to 5G is being considered. In an environment with substantial propagation loss, such as that in the case of millimeter waves, massive MIMO can realize beamforming according to the position of terminal stations. Therefore, it is important to understand the direction of arrival of millimeter waves. In this letter, we clarify the relationship between power, delay time, and direction of arrival while focusing on the horizontal direction, using a 48-element massive array in the 20 GHz band in urban Japan. In addition, we obtain direction-of-arrival (DoA) estimation results using an iterative reduction threshold algorithm (ISTA), which is based on compressed sensing. It is shown that the dominant path can be estimated by using the ISTA even with approximately five elements.

关键词： Direction-of-arrival estimation Machine learning algorithms 5G mobile communication Estimation Massive MIMO Ray tracing Millimeter wave propagation 5G circular array direction-of-arrival (DoA) estimation iterative reduction threshold algorithm (ISTA) massive multiple-input– multiple-output (MIMO)

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Simple and accurate two-dimensional angle estimation for a single source with uniform circular array

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IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS 2008年第0期7卷 78-80页

作者： Wu, Yuntao So, H. C. City Univ Hong Kong Dept Elect Engn Kowloon Hong Kong Peoples R China

A least squares algorithm for two-dimensional (2-D) angle estimation of a single narrowband source impinging on a uniform circular array (UCA) is presented. Utilizing the centrosymmetric array configuration, a new correlation-based method is devised to obtain closed-form estimates of the azimuth and elevation angles. Although the proposed method is computationally simpler than the conventional schemes, computer simulations show that it can approach optimum estimation performance.

关键词： array signal processing circular array two-dimensional (2-D) angle estimation

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DIFFRACTION TOMOGRAPHIC IMAGING WITH A circular array

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IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL 1995年第4期42卷 787-789页

作者： NAIDU, PS VASUKI, A SATYAMURTHY, P ANAND, L Department of ECE Indian Institute of Science Bangalore India

A new approach of imaging an object profile from the scattered wavefield, which is measured using a large (far field approximation) circular array of sensors surrounding the object, is described, It is shown that the measured field is itself proportional to the Fourier transform of the object, Consequently, as compared to the existing methods, such as back propagation method for a linear array, our method overcomes the well known effects of the finite window in numerical evaluation of the Fourier transform of the measured scattered field. This results into improved reconstruction.

关键词： Fourier transforms acoustic tomography image reconstruction ultrasonic diffraction ultrasonic imaging Fourier transform circular array diffraction tomographic imaging far field approximation object profile scattered wavefield Tomography Ultrasonography image reconstruction circular array Ultrasonic Tomography Fourier Transform far-field

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Sound field simulation for circular array based on spatial circular convolution

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ACOUSTICAL SCIENCE AND TECHNOLOGY 2014年第2期35卷 99-107页

作者： Haneda, Yoichi Furuya, Ken'ichi Koyama, Shoichi Niwa, Kenta Kobayashi, Kazunori Univ Electrocommun Grad Sch Informat & Engn 1-5-1 Chofugaoka Choufu 1828585 Japan Oita Univ Fac Engn Dept Comp Sci & Intelligent Syst Oita 8701192 Japan NTT Corp NTT Media Intelligence Labs Musashino Tokyo 1808585 Japan

We propose a sound field simulation method for a circular array. In a linear array, when the distance between the loudspeaker units is equal to the interval between the observation points on the lines paralleled to the array, the sound pressures on the observation line can be calculated by the spatial convolution of the set of transfer functions and loudspeakers' driving signals. To apply this idea to a circular array, we developed a simulation method with equiangular observation points on the circle. The spatial circular convolution without zero padding, which is necessary in a linear array, can be used with this method. By conducting convolution based on the fast Fourier transform (FFT), the computational complexity is greatly reduced. Moreover, assuming that non-active loudspeakers are included in the loudspeaker array, the proposed method can be applied to an unequal interval array. For example, when the number of observation points is set to 128 and the number of loudspeakers is set to 32, circular convolution with FFT reduces the computational complexity to 75% compared to the conventional method. In addition, we argue that this method can be applied to a room in which the first reflected sounds are reflected from the floor. The proposed method is useful for simulating the sound field for a circular array when the suitable spatial samplings of the circumferential and radial directions are set.

关键词： Sound field simulation Loudspeaker array circular array Spatial convolution

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PREDICTION OF circular array PHASE MODE CHARACTERISTICS

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ELECTRONICS LETTERS 1988年第13期24卷 811-812页

作者： JONES, MR GRIFFITHS, HD Dept. of Electron. & Electr. Eng. Univ. Coll. London

It is shown how the characteristics of phase modes excited around a circular antenna array can be predicted from a knowledge of the individual element pattern measured in the array environment. A set of experimental r... 详细信息

关键词： antenna array antenna arrays antenna radiation patterns antenna theory circular array element pattern phase mode characteristics

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Highly Accurate Direction-of-Arrival Estimation with a Uniform circular array

Highly Accurate Direction-of-Arrival Estimation with a Unifo...

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International Symposium on Antennas and Propagation (ISAP)

作者： Chen, Kuan-Hao Kiang, Jean-Fu Natl Taiwan Univ Grad Inst Commun Engn Taipei 106 Taiwan

A mutual coupling compensation method is proposed to enhance the estimation accuracy of an incident wave upon a uniform circular array (UCA), with the initial guess estimated using the UCA-rank reduction (RARE) method... 详细信息

ISBN: (纸本)9789869147408

关键词： Direction of arrival coupling compensation circular array

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Wide-Band Low-Profile circular array of H-Plane Horn Antennas

Wide-Band Low-Profile Circular Array of H-Plane Horn Antenna...

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Asia-Pacific Microwave Conference (APMC)

作者： Yang, Lei Wu, Wen Shen, Zhongxiang Nanjing Univ Sci & Technol Ministerial Key Lab JGMT Jiangsu 210094 Peoples R China

ISBN: (纸本)9781457713309;9781457713316

This paper presents a novel design of low-profile circular array of H-plane horn antenna whose radiating aperture is on the side surface of a short solenoid. The designed antenna operates from 835MHz to 2436MHz and exhibits good radiation patterns and gain over the entire operating frequency band. Simulated results are provided to verify the design concept. This proposed antenna is potentially very useful for spectrum monitoring systems mounted a moving platform.

关键词： circular array H-plane horn antenna wide-band antenna

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Antenna Pattern Synthesis Using Phase Mode for circular array with Reduced Side-lobe Level

Antenna Pattern Synthesis Using Phase Mode for Circular Arra...

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IEEE Asia-Pacific Microwave Conference (APMC)

作者： Singh, Mahesh Ghosh, Bratin Indian Inst Technol Dept Elect & Elect Commun Engn Kharagpur W Bengal India

ISBN: (纸本)9781728169620

This work investigates the pattern synthesis of discrete antenna elements placed equidistantly on a circular ring. In order to synthesize the antenna pattern, the phase mode analysis is investigated to compute the excitation amplitude and phase of discrete elements. A very low side-lobe level compared with earlier phase mode based approaches is achieved using the modified |J(1)(x)/x| pattern. The desired side-lobe level (SLL) and beam direction in the pattern characteristics are also effectively achieved. It is observed that a variation in the phase distribution with the amplitude distribution constant results in beam steering, while, for reducing the SLL, both the amplitude and phase distributions need to be suitably changed. A slight increase in beamwidth is observed with the reduction in the SLL.

关键词： Pattern synthesis phase mode circular array SLL

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Decoupling Mechanism for Improving the Radiation Gain of an AOA Estimation circular array Antenna

Decoupling Mechanism for Improving the Radiation Gain of an ...

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IEEE Conference on Antenna Measurements and Applications (CAMA)

作者： Iwamoto, Daishi Honda, Kazuhiro Ogawa, Koichi Toyama Univ Grad Sch Engn 3190 Gofuku Toyama Toyama 9308555 Japan

ISBN: (纸本)9781509050284

In this paper, the effect of electromagnetic mutual couplings on a circular array antenna for angle of arrival (AOA) estimation was investigated. The analytical results reveal that even in the presence of mutual couplings, the radiation gain of the antenna for AOA estimation is nearly the same as that of a half-wavelength dipole antenna. We verified that this phenomenon is attributed to the decoupling mechanism caused by the cancellation of signals induced in 50-Omega load impedances.

关键词： Interferometric angle of arrival circular array Decoupling mechanism Mutual coupling Connected car

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Design of circular array of circular Subarrays for Scannable Pattern using Rotational Symmetry

Design of Circular Array of Circular Subarrays for Scannable...

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

作者： Elizarraras, Omar Mendez, Aldo Reyna, Alberto Panduro, Marco A. Covarrubias, David Univ Autonoma Tamaulipas Unidad Acad Multidisciplinaria Reynosa Rhode Reynosa Tamaulipas Mexico CICESE Res Ctr Elect & Telecommun Dept Ensenada Baja California Mexico

ISBN: (纸本)9781538632840

This paper presents a design of fractal antenna array based in circular arrays of circular subarrays for scannable pattern using rotational symmetry properties for a maximum performance in terms of side lobe level (SLL), directivity (DIR) and dynamic range ratio (DRR). The performance of the fractal antenna array optimized is compared with respect to the cases of uniform amplitude excitation and the Taylor amplitude distribution using conventional progressive phase for the same array geometry.

关键词： Fractal antenna array circular array circular subarray rotational symmetry side lobe level

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