Results 171 to 180 of about 304 (202)

High-Frequency Ultrasound Imaging With Sub-Nyquist Sampling

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2022
Implementation of a high-frequency ultrasound (HFUS) beamformer is computationally challenging because of its high sampling rate. This article introduces an efficient beamformer with sub-Nyquist sampling (or bandpass sampling) that is suitable for HFUS imaging.
Jinbum Kang, Heechul Yoon, Changhan Yoon, Stanislav Y. Emelianov   +3 more
openaire   +2 more sources

Sub-Nyquist Sampling for Target Detection in Clutter

2018 IEEE 10th Sensor Array and Multichannel Signal Processing Workshop (SAM), 2018
We analyze target detection for sub-Nyquist radar in an environment with clutter. The target is assumed to be a Gaussian point target and the clutter a stationary Gaussian random process. The optimal detector and detection probability under the Neyman-Pearson criterion is derived.
Yang Li 0047, Qian He 0002, Rick S. Blum, Kumar Vijay Mishra   +3 more
openaire   +1 more source

The algorithms of sub-Nyquist sampling on TV

Proceedings. IEEE Energy and Information Technologies in the Southeast', 2003
A component color TV signal called the TCM signal is proposed, and an algorithm of subsampling on the TCM signal is described. Results both from computer simulation and hardware display show that the picture quality of this method is satisfactory. A 3-D subsampling algorithm is proposed.
D. Xu, Z.-Y. Quan
openaire   +1 more source

Cyclostationary feature detection from sub-Nyquist samples

2011 4th IEEE International Workshop on Computational Advances in Multi-Sensor Adaptive Processing (CAMSAP), 2011
Wideband spectrum sensing which requires detecting the presence or absence of signals in a wideband channel faces multiple practical issues. Current bandwidth limitations of state-of-the-art analog to digital converters require alternative approaches to be considered for wideband sensing.
Deborah Cohen, Eric Rebeiz, Varun Jain, Yonina C. Eldar, Danijela Cabric   +4 more
openaire   +1 more source

Sub-Nyquist sampling achieves optimal rate-distortion

2015 IEEE Information Theory Workshop (ITW), 2015
The minimal sampling frequency required to achieve the rate-distortion function of a Gaussian stationary process is analyzed. Although the Nyquist rate is the minimal sampling frequency that allows perfect reconstruction of a bandlimited signal from its samples, relaxing perfect reconstruction to a prescribed distortion may allow a lower sampling ...
Alon Kipnis, Andrea J. Goldsmith, Yonina C. Eldar   +2 more
openaire   +1 more source

A novel Sub-Nyquist sampling of sparse wideband signals

2013 IEEE International Conference on Acoustics, Speech and Signal Processing, 2013
We propose a Sub-Nyquist sampling scheme using only one mixer, one filter bank with M subfilters and M low rate ADCs. Compared to the MWC (Modulated Wideband Converter) system in [1], the proposed sampling system has several complexity advantages. First, due to the use of only one mixer, the hardware complexity for analog circuits is significantly ...
Chia-Hua Lin, Shang-Ho Tsai, Gene C. H. Chuang   +2 more
openaire   +1 more source

Aliasing-tolerant sub-Nyquist sampling of FRI signals

2013 IEEE International Conference on Communications (ICC), 2013
This paper addresses the sampling of Finite Rate of Innovation (FRI) signals and proposes new lower bounds for accurate reconstruction. Recently, the FRI approach has been established next to the Compressed Sensing framework to deal with signals which are sparse in their parametric description.
Andre Angierski, Volker Kühn 0001
openaire   +1 more source

Cyclic spectrum reconstruction from sub-Nyquist samples

2014 IEEE Global Communications Conference, 2014
Communication signals are often cyclostationary, that is they have statistical characteristics that vary periodically in time. In the frequency domain, this translates into correlation between spectral components of the signal. As a result, the cyclic spectrum, a characteristic function of the second-order moment of such signals, exhibits spectral ...
Deborah Cohen, Yonina C. Eldar
openaire   +1 more source

Sub-Nyquist sampling of OFDM signals for cognitive radios

2014 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2014
We investigate sampling and detection of orthogonal frequency-division multiplexing (OFDM) signals with unknown carriers at sub-Nyquist rates. Efficient acquisition and processing of such broadcast signals is a challenge but constitutes a crucial part of enabling cognitive radios.
Tom Zahavy, Oran Shayer, Deborah Cohen, Alex Tolmachev, Yonina C. Eldar   +4 more
openaire   +1 more source

Sub-Nyquist sampling of NTSC video

IEEE 1988 International Conference on Consumer Electronics Digest of Technical Papers., 2003
For deghosting purposes, both the in-phase and quadrature parts of the vestigial sideband TV signal are needed. This new scheme can reduce the sampling rate to lower than the Nyquist rate of either part. It comprises sampling rate reduction and complex signal processing for signal recovery. >
openaire   +1 more source