Results 21 to 30 of about 18,005 (249)
Sub-Nyquist pulse Doppler MIMO radar [PDF]
2017 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2017 Pulse Doppler multiple input multiple output (MIMO) radar allows to simultaneously detect targets' range, azimuth and velocity. Achieving high resolution requires a large number of transmit and receive antennas, as well as high sampling rates leading to a torrent of samples.
Cohen, David +3 more
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IEEE Photonics Journal, 2018 Delay-division-multiplexing (DDM) involves the use of signal preprocessing for the detection of data via sub-Nyquist analog-to-digital sampling, based on preallocated relative sampling delays among optical network users (ONUs) in an orthogonal frequency ...
Jhih-Hao Hsu +7 more
doaj +1 more source
Random sub-Nyquist polarimetric modulator [PDF]
Applied Optics, 2016 We show that it is possible to measure polarization with a polarimeter that gets rid of the seeing while still measuring at a frequency well below that of the seeing. We study a standard polarimeter made of two retarders and a beamsplitter. The retarders are modulated at $\sim 500$ Hz, a frequency comparable to that of the variations of the refraction ...
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Sub-Nyquist Sampling in Shift-Invariant Spaces
2020 28th European Signal Processing Conference (EUSIPCO), 2021 We introduce a novel framework for acquisition of analog signals by combining compressive sensing (CS) and the shift-invariant (SI) reconstruction procedure. We reinterpret the random demodulator as a system that acquires a linear combination of the samples in the conventional SI setting with the box function as the sampling kernel.
Vlašić, Tin, Seršić, Damir
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Low Complexity Sub-Nyquist Wideband Spectrum Sensing for Cognitive Radio
IEEE Access, 2018 In order to provide more available spectrum and quickly switchover, wideband spectrum sensing (WSS) is desirable for cognitive radio. Sub-Nyquist sampling is crucial for WSS to reduce energy and computational costs, while the existing algorithms based on
Jian Yang, Min Jia, Xuemai Gu, Qing Guo
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Fronthaul Optical Links Using Sub-Nyquist Sampling Rate ADC for B5G/6G Sub-THz Ma-MIMO Beamforming
IEEE Access, 2022 This paper details fronthaul optical links using sub-Nyquist sampling rate analog-to-digital converters (ADCs) for Beyond fifth generation (B5G) and 6G sub-THz massive multiple-input multiple-output (Ma-MIMO) beamforming.
Pin-Hsuan Ting +5 more
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IEEE Access, 2018 Sub-Nyquist sampling is a common means of interfering with inverse synthetic aperture radar (ISAR) imaging, which has been validated for the feasibility of 1-D compressive sensing (CS) ISAR imaging.
Jiyuan Chen +3 more
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Sub-Nyquist SAR via Quadrature Compressive Sampling with Independent Measurements
Remote Sensing, 2019 This paper presents an efficient sampling system for the acquisition of synthetic aperture radar (SAR) data at sub-Nyquist rate. The system adopts a quadrature compressive sampling architecture, which uses modulation, filtering, sampling and digital ...
Huizhang Yang +3 more
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High-speed, sub-Nyquist interferometry
Optics Express, 2011 The velocity measurement limit in dynamic interferometry is vNyq, the velocity at which the interferogram is sampled at the Nyquist limit. We show that vNyq can be exceeded by assuming continuity of the surface motion and unwrapping the velocity modulo 2vNyq.
Tao, Wu +2 more
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Wideband Power Spectrum Estimation Based on Sub-Nyquist Sampling in Cognitive Radio Networks
IEEE Access, 2019 The wideband spectrum estimation is an essential step in the wireless network. In order to avoid employing power-hungry high-rate analog-to-digital converters (ADCs), the CS-based sub-Nyquist sampling approaches are used to estimate the wideband spectrum.
Yijiu Zhao +4 more
doaj +1 more source