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Sinusoidal RF DACs for undersampled LC bandpassΔ modulabrs
2007 Edition, August 1, 2007 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

In this paper, we present a systematic technique to design bandpass LC Sigma Delta modulators with sinusoidal feedback DACs. The output resistance of the DAC degrades the quality factor of the LC resonator and the DAC output capacitance modifies its...

A direct down converted low-jitter band pass delta sigma receiver with frequency translating technique and sinusoidal RF DAC
2012 Edition, December 1, 2012 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

A direct-converted band pass delta sigma receiver (BPDSX) with a frequency translating technique incorporating the proposed sinusoidal RF DAC, which reduces noise power such as out of band harmonics and jitter noise, is proposed. The proofreading simulation successfully reveals...

A Fast Gradient-Based Iterative Algorithm for Undersampled Phase Retrieval
Volume PP - IEEE - Institute of Electrical and Electronics Engineers, Inc.

This work develops a fast iterative shrinkagethresholding algorithm which can efficiently tackle the issue in undersampled phase retrieval. First, using the gradient framework and proximal regularization theory, the undersampled phase retrieval problem is formulated as an optimization...

Undersampled dynamic X-ray tomography with dimension reduction Kalman filter
Volume PP - IEEE - Institute of Electrical and Electronics Engineers, Inc.

In this paper, we propose prior-based dimension reduction Kalman filter for undersampled dynamic X-ray tomography. With this method, the X-ray reconstructions are parameterized by a low-dimensional basis. Thus, the proposed method is a) computationally very light; and b) extremely...

Bayesian Reconstruction of Undersampled Multicoil Hardi
2019 Edition, September 1, 2019 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

High-angular-resolution diffusion imaging (HARDI) relies on multicoil acquisitions for clinical applications. HARDI scan time can be reduced by undersampling the set of gradient directions. Typical methods for undersampled HARDI reconstruction use two-stage schemes that first...

Frequency Estimator Based on Spectrum Correction and Remainder Sifting for Undersampled Real-valued Waveforms
Volume PP - IEEE - Institute of Electrical and Electronics Engineers, Inc.

Frequency estimation of undersampled waveforms receives increasingly attentions in communication, radar signal processing, instrumentation and measurements etc. However, due to the lack of recognizing the correct remainder between two side spectra, the existing Chinese Remainder Theorem...

Ultrasonic wave-speed diffraction tomography with undersampled data using virtual transducers
Volume PP - IEEE - Institute of Electrical and Electronics Engineers, Inc.

Ultrasonic diffraction tomography (DT) offers a way to achieve high-resolution imaging of the wavespeed map, and hence has strong potential applications in medical diagnosis and Nondestructive evaluation (NDE). Ideal images can be obtained with a complete array of sensors surrounding the scatterer,...

Pixel-Level Vibration Source Detection Using Undersampled Video Sequences
2018 Edition, October 1, 2018 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

This study proposes a concept of vision-based vibration source localization that can extract objects vibrating at hundreds of Hz with pixel-level accuracy using images captured at an undersampled frame rate that is much lower than the vibration frequency. We discuss how to determine the...

Guided wave retrieval from temporally undersampled data
2017 Edition, September 1, 2017 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

The acquisition of ultrasonic guided waves for full wavefield nondestructive evaluation (NDE) applications is often a time-consuming procedure. Moreover, the amount of data to be stored over time can be enormous. Consequently, to improve storage efficiency and reduce the acquisition time, it...

Guided wave retrieval from temporally undersampled data
2017 Edition, September 1, 2017 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

Within the realm of structural health monitoring (SHM), employing guided waves as an efficacious means of inspecting structures for potential defects has been steadily gaining ground, owing to the numerous advantages it provides, including accessibility and low cost of transducers as well as...

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