Results 251 to 260 of about 3,274,533 (303)

Generalized coherence (signal detection)

ICASSP-88., International Conference on Acoustics, Speech, and Signal Processing, 2003
The authors introduce a test for detecting the presence of a common signal on M noisy channels that generalizes a popular technique using the magnitude-squared coherence (MSC) estimate for detecting a common signal on two channels. The basis of this test is the generalized coherence estimate, a statistic involving the normalized M*M Gram matrix ...
Herbert Gish, Douglas Cochran
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Improved Coherent Detection of GMSK

IEEE Transactions on Communications, 1984
It is pointed out that the degradation effect due to premodulation filtering in GMSK (Gaussian-filtered minimum shift keying) is largest at the edges of time slots, which instant has been adopted as the sample timing in the conventional coherent detector of GMSK. Then a new coherent detector employing signals sampled at a different timing in a deviated-
Mitsuru Ishizuka, Yasuhiko Yasuda
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Coherent detection of partially coherent sources

Optics Letters, 1980
The mean square of the beating component of the photodetector output current of a coherent optical or infrared receiver, illuminated by partially coherent quasi-monochromatic radiation, is expressed in terms of the mutual intensity functions of the signal and local reference fields on the detector’s active surface.
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Coherent pulse detection and multi-channel coherent detection based on a single balanced homodyne receiver [PDF]

Optics Express, 2007
The performance of coherent pulse detection (CPD) and multichannel coherent detection (MCCD) based on a single dual-balanced homodyne receiver was experimentally demonstrated using a grating-coupled hybridly mode-locked semiconductor laser. Compared with
Wangkuen Lee
exaly   +2 more sources

Conditions for the detection of coherent motion

Vision Research, 1991
Previous studies have suggested that human motion perception involves at least two different detection stages: an orientation selective or component motion stage and a combination stage where selectivity to the coherent motion of a pattern, e.g. a plaid is established. These studies are inconclusive as to the motion detection process per se.
A V, van den Berg, W A, van de Grind
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Coherent Detection Signal-to-Noise

Applied Optics, 1975
General equations are derived for the signal-to-noise ratio of a coherent (heterodyne) receiver in terms of the distribution functions of the signal and local oscillator fields and the size and shape of the detector. The optimum local oscillator field distribution is identical to the signal field distribution over the detector surface. The special case
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Simplified coherent detection of CPM

IEEE Transactions on Communications, 1995
Summary: This proposal avoids the complex matched-filter bank required for optimal detection. Instead, two simple lowpass filters are employed, followed by a sampler and a Viterbi algorithm that accounts for ISI. For representative modulations, it is shown that near-optimal performance can be achieved with just two samples per baud.
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Multiresolution detection of coherent radar targets

IEEE Transactions on Image Processing, 1997
We develop and investigate several novel multiresolution algorithms for detecting coherent radar targets embedded in clutter. These multiresolution detectors exploit the fact that prominent target scatterers interfere in a characteristic manner as resolution is changed, while multiresolution clutter signatures are random. We show, both on simulated and
Nikola S. Subotic, Brian J. Thelen, John D. Gorman, Michael F. Reiley   +3 more
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DETECTING COHERENT ENERGY

International Journal of Modern Physics C, 2012
We apply the mathematics of cognitive radio to a single receiver to obtain a new coherent energy metric. This allows us to derive the time correlation law separating Gaussian colored noise from coherent signal energy.
P. D. MORLEY, JERRY W. BROWN
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Coherence requirement for partially coherent correlation detection

Applied Physics B Photophysics and Laser Chemistry, 1983
The coherence requirement for correlation detection is determined using the theory of partially coherent light. It is shown that the requirement for temporal coherence strongly dependes on the spatial frequency and the spatial extension of the target (i.e., space bandwidth product).
F. T. S. Yu, Y. W. Zhang, S. L. Zhuang
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