Results 261 to 270 of about 537,997 (309)

Target spatial and frequency scattering diversity property for diversity MIMO radar

Signal Processing, 2011
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Yongbo Zhao
exaly   +2 more sources

Performance comparison of frequency-diversity and frequency-hopping spread-spectrum systems

IEEE Transactions on Communications, 1997
In the presence of partial-band Gaussian interference the frequency hopping spread spectrum system, without and with optimum diversity, performs worse than a system called frequency diversity spread spectrum. This latter has the advantage of allowing coherent reception with coherent diversity combining.
G K Kaleh
exaly   +2 more sources

Lamb Wave Frequency Diverse Array

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2022
The imaging method based on the conventional phased array (PA) can only realize angle focusing. To break through the above limitations, frequency diverse array (FDA) is first introduced from radar to Lamb wave, which opens up a possibility to realize angle-range focusing in damage localization. The energy pattern of FDA without considering the features
Yanfeng Lang, Zhibo Yang, Laihao Yang, Xuefeng Chen   +3 more
openaire   +2 more sources

Coherence Diversity in Time and Frequency

2016 IEEE Global Communications Conference (GLOBECOM), 2016
In practice, wireless nodes may have different mobility and/or different scattering environment leading to disparity in coherence time and/or coherence bandwidth. Coherence diversity, as a novel source of gain, exploits fading condition disparity of different nodes to provide gain.
Mohamed Fadel, Aria Nosratinia
openaire   +1 more source

OFDM With Adaptive Frequency Diversity

IEEE Signal Processing Letters, 2009
Code-division multiplex orthogonal frequency-division multiplex (CDM-OFDM) has received considerable attention due to its superior resilience against subcarrier fading in comparison with conventional OFDM. More recently, group-orthogonal CDM-OFDM (GO-CDM-OFDM) has been considered as a suitable method to extract additional frequency diversity of the ...
Felip Riera-Palou, Guillem Femenias
openaire   +1 more source

Frequency Diversity Speckle Processing

Ultrasonic Imaging, 1987
Ultrasonic waveform data from a tissue-mimicking phantom containing low contrast targets was digitized, stored and processed prior to creating and displaying ultrasonic images. Speckle reduction was performed by digital filtering of the waveform data with appropriately spaced and weighted digital filters, prior to both coherent and incoherent image ...
S M, Gehlbach, F G, Sommer
openaire   +2 more sources

The diversity of high-frequency traders

Journal of Financial Markets, 2012
The regulatory debate concerning high-frequency trading (HFT) emphasizes the importance of distinguishing different HFT strategies and their influence on market quality. Using data from NASDAQ-OMX Stockholm, we compare market-making HFTs to opportunistic HFTs.
Björn Hagströmer, Lars L. Norden
openaire   +1 more source

Conceptual test of frequency diversity lidar

Applied Optics, 1987
Atmospheric remote sensing by lidar frequently requires an accurate measurement of the mean intensity of the laser backscattered radiation. In the case of infrared coherent lidars, the return signal is characterized by rapid and deep fluctuations resulting from the interference of the fields backscattered to the lidar from moving, randomly located ...
R M, Schotland, P V, Cvijin, Y, Zhao, A M, Hudor   +3 more
openaire   +2 more sources

Impact of Frequency Diversity and Multi-User Diversity in IFDMA

2010 IEEE 71st Vehicular Technology Conference, 2010
Single-carrier frequency division multiple access (SC-FDMA) has been decided to be adopted in the uplink of the future wireless communication system. Interleaved frequency division multiple access (IFDMA), whose transmitted signal is generated in the time domain, is a candidate of SC-FDMA.
Yuichi Kazama, Akira Yamasaki, Koichi Adachi, Masao Nakagawa   +3 more
openaire   +1 more source

Frequency Diverse MIMO Techniques for Radar

IEEE Transactions on Aerospace and Electronic Systems, 2013
It has been shown over several decades of radar research that the exploitation of diversity in a number of domains (space, frequency, time, polarization, and, recently, waveform) can provide increased agility, flexibility, robustness, and capabilities to the radar system. However this is often achieved either through efforts in system design, increased
Pier Francesco Sammartino, Christopher J. Baker, Hugh D. Griffiths   +2 more
openaire   +1 more source