Frequency-Diverse Computational Direction of Arrival Estimation Technique

Yurduseven, Okan; Abbasi, Muhammad Ali Babar; Fromentèze, Thomas; Fusco, Vincent

doi:10.1038/s41598-019-53363-3

Cited by 39 publications

(59 citation statements)

References 34 publications

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“…In general, the accuracy of the frequency-diverse imaging technique is heavily governed by the phase calibration precision of the sensing matrix [34,42] and we note that such constraints can be substantially simplified using phaseless reconstruction algorithms [43,44]. Although demonstrated at X-band frequencies and for near-field radar imaging, the presented technique can be adopted in a plethora of applications, from remote sensing to direction of arrival estimation [45], and can readily be scaled to different frequency bands, such as millimetre-wave band and above.…”

Section: Discussionmentioning

confidence: 99%

Lens-Loaded Coded Aperture with Increased Information Capacity for Computational Microwave Imaging

et al. 2020

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Computational imaging using coded apertures offers all-electronic operation with a substantially reduced hardware complexity for data acquisition. At the core of this technique is the single-pixel coded aperture modality, which produces spatio-temporarily varying, quasi-random bases to encode the back-scattered radar data replacing the conventional pixel-by-pixel raster scanning requirement of conventional imaging techniques. For a frequency-diverse computational imaging radar, the coded aperture is of significant importance, governing key imaging metrics such as the orthogonality of the information encoded from the scene as the frequency is swept, and hence the conditioning of the imaging problem, directly impacting the fidelity of the reconstructed images. In this paper, we present dielectric lens loading of coded apertures as an effective way to increase the information coding capacity of frequency-diverse antennas for computational imaging problems. We show that by lens loading the coded aperture for the presented imaging problem, the number of effective measurement modes can be increased by 32% while the conditioning of the imaging problem is improved by a factor of greater than two times.

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Section: Discussionmentioning

confidence: 99%

Lens-Loaded Coded Aperture with Increased Information Capacity for Computational Microwave Imaging

et al. 2020

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“…Here, we present a restructured mode-mixing cavity model. Our discussion follows previously presented studies in [5,7] where we established that a mode-mixing cavity can be used for DoA estimation. We present a unique antenna architecture in this paper which enhances the mode-mixing cavity's channel information capturing capabilities.…”

Section: Introductionmentioning

confidence: 55%

“…Out of around 77 simulated resonant modes, the correlation between gain plots against 11 modes is given in Fig. 2(d), where generally correlation is low, providing the required conditionality for DoA estimation following the methods in [5]. Finally, Fig.…”

Section: Lens-loaded Cavity Performancementioning

confidence: 91%

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Millimeter-wave Channel Sounding Technique Using Oversized Lens–loaded Cavity

Abbasi¹,

Fusco²,

Yurduseven³

2021

2021 15th European Conference on Antennas and Propagation (EuCAP)

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This paper briefly summarizes an ongoing investigation on millimetre-wave (mmWave) channel sounding using a low complexity single RF chain mode mixing lens-loaded cavity. The main advantage of using the mode-mixing technique is to be able to process the information required to estimate the direction-of-arrival (DoA) of the incoming signal just by reading the signal at the single RF-chain output. This massively reduces the system complexity compared to a standard N -element array antenna that requires around N times RF chains. Specifically, this paper presents a way by which signal directivity towards the coverage area can be enhanced by placing a lens in-front of an oversized cavity. This provides an extra channel gain to the incoming wave, consequently enhancing the DoA estimation resolution. This ongoing investigation can substantially simplify the physical hardware layer of the mmWave channel sounder, offering a great potential for the forthcoming mmWave 5G.

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“…For this scenario, it is possible to use the concept of random phase distribution across the IRS, as presented in Fig. 4(c), to facilitate a compressive channel estimation technique [49]. Leveraging such a technique, the IRS can be used for both channel estimation and beam-forming.…”

Section: Discussionmentioning

confidence: 99%

Intelligent Reflecting Surfaces With Spatial Modulation: An Electromagnetic Perspective

Yurduseven

Assimonis

Matthaiou

2020

IEEE Open J. Commun. Soc.

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Electromagnetic wave control using the concept of a reflecting surface is first studied as a near-field and a far-field problem. Using a secondary source present in a wireless communication environment, such as a backscatter tag, it is possible to leverage the incoming radiation from the source as a reference-wave to synthesize the desired wavefront across the reflecting surface, radiating a field of interest. In this geometry, the phase grating, which is synthesized using an array of sub-wavelength unit cells, is calculated by interacting the incident reference-wave and the desired wavefront, similar to a hologram. When illuminated by the reference-wave, the reflected wavefront from the calculated phase grating is guaranteed to constructively add in the direction of the desired radiation (beam-steering in the far-field) and also focus at the intended depth (beam-focusing in the radiative near-field). Next, leveraging a dynamic modulation mechanism in the context of an intelligent reflective surface (IRS) illuminated by a backscatter tag, we demonstrate that one can selectively focus and defocus at an arbitrarily positioned receiver within the 3D field of view of the reflecting surface. This enables the control of the amplitude of the radiated electric field at the receiver location, paving the way for a spatial modulation mechanism by means of reconfiguring the reflecting surface in a backscattered wireless communication environment. In addition to the phase modification approach on a unit cell level to reconfigure the aperture radiated wavefronts, we finally present a time varying IRS concept making use of a time-delay based approach relying on a delay adjustment between the reflection coefficients of the IRS' unit cell lattices.

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Frequency-Diverse Computational Direction of Arrival Estimation Technique

Cited by 39 publications

References 34 publications

Lens-Loaded Coded Aperture with Increased Information Capacity for Computational Microwave Imaging

Lens-Loaded Coded Aperture with Increased Information Capacity for Computational Microwave Imaging

Millimeter-wave Channel Sounding Technique Using Oversized Lens–loaded Cavity

Intelligent Reflecting Surfaces With Spatial Modulation: An Electromagnetic Perspective

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