Results 301 to 310 of about 463,178 (329)

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
openaire   +1 more source

Coherent optical BPSK detection

IEEE Proceedings of the SOUTHEASTCON '91, 2002
Summary form only given. A coherent phase-locked synchronous oscillator (CPSO) was created by adding a feedforward and a feedback loop to the SO. An optically excited CPSO network was formed using a 4.3-GHz AVANTEK oscillator. Before the CPSO loop was formed, the oscillator was tuned near the subcarrier frequency with the DC bias in the loop filter ...
V. Uzunoglu, Z. Ma, M.H. White
openaire   +1 more source

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
openaire   +2 more sources

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 ...
H. Gish, D. Cochran
openaire   +1 more source

Coherent, Self-Coherent, and Differential Detection Systems

2011
In order to meet the ever-increasing demand in telecommunication capacity, fiberoptic communication systems have been evolving dramatically over the past decade [1, 2]. The fiberoptic communication traffic growth has been at a rate of about 2 dB per year, representing a traffic increase of a factor of 100 in 10 years [1, 2].
Xiang Liu, Moshe Nazarathy
openaire   +1 more source

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
N S, Subotic, B J, Thelen, J D, Gorman, M F, Reiley   +3 more
openaire   +2 more sources

Optical heterodyne (coherent) detection

American Journal of Physics, 1988
The optical heterodyne principle is described and its history traced. Early hopes for optical communication by this technique were frustrated by problems of wavefront degradation and laser frequency instability. However, fiber optics has recently revitalized this as an attractive possibility. In the interim, many other successful applications have been
openaire   +1 more source

Fast stereovision by coherence detection

1997
A new approach to stereo vision based on similarities between optical flow estimation and disparity computation is introduced. The fully parallel algorithm utilizes fast filter operations and aliasing effects of simple disparity detectors within a coherence detection scheme.
openaire   +1 more source

Algorithms for Coherent Detection

Optical Fiber Communication Conference, 2010
□ Fiber optics is converging with other digital communications fields – cellular, satellite, digital subscriber line, etc. □ But techniques from existing fields are of limited help ▪ our carrier linewidth is much higher, 10-4 baud rate ▪ our impairments are of long duration, >100 symbols ▪ our data rate is much higher, 100Gb/s □ We must develop our own
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Optically detected spin coherence of single molecules

Physical Review Letters, 1993
no ...
Wrachtrup, J., Vonborczyskowski, C., Bernard, J., Orrit, M., Brown, R.   +4 more
openaire   +3 more sources