Results 221 to 230 of about 89,588 (266)

Coherent Detection of DQPSK for Tolerance to Coherent Crosstalk

Coherent Optical Technologies and Applications, 2008
Coherent crosstalk is a significant challenge in OCDM/A systems especially for high spectral efficiency coherent implementations. We study its impact on DQPSK with coherent detection. An improvement in performance is seen over direct detection.
A. Agarwal, P. Toliver, T. Banwell, R. Menendez, J. Jackel, S. Etemad   +5 more
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

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

Ring-coupled chaotic generator for coherent and non-coherent detection

IFAC Proceedings Volumes, 2013
Abstract This paper deals with chaotic encryption and observer synthesis for coherent detection using a new ring-coupled map firstly introduced by Lozi. The specificity of the switched map under investigation is that it exhibits excellent properties for chaotic encryption, but has no standard solution for the observer design.
Andrea Espinel, Ina Taralova
openaire   +1 more source

Radar detection in coherent Weibull clutter

IEEE Transactions on Acoustics, Speech, and Signal Processing, 1987
In this correspondence, a new model for the Weibull clutter is presented. Then attention is turned to the design of the optimum radar processor to detect an a priori known target signal embedded in coherent Weibull clutter. An original detection scheme is presented and the corresponding performance is assessed.
Alfonso Farina, A. Russo, F. Scannapieco
openaire   +1 more source

Coherent Detection of Targets in Clutter.

1996
The area of research dedicated to the design and optimisation of radar detection schemes is a constantly evolving held of study. This paper contributes to the held of parametric detection by utilising the Generalised Bessel Function K (GBK) distribution with parameter c = 2, (the Jakeman-Tough model), as a model for radar clutter in the design of an ...
Smith, JC, Martin, M, Iskander, DR
openaire   +2 more sources

Coherent MAP detection of DQPSK bits

IEEE Communications Letters, 2000
Both IS-136 and PDC digital cellular systems employ forward error correction (FEC) encoding followed by a form of DQPSK modulation. In this letter, we derive the maximum a posteriori (MAP) bit detector for DQPSK modulation in non-ISI channels for a coherent receiver with one or more antennas.
Gregory E. Bottomley, Hüseyin Arslan, Rajaram Ramesh, Gustav Brismark   +3 more
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

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
openaire   +1 more source

Detection of Cyclostationarity Using Generalized Coherence

2018 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2018
A class of detectors for cyclostationarity is introduced. These detectors are based on the use of generalized coherence to measure correlation among two or more collections of random vectors. The generalized coherence framework allows any finite collection of pertinent samples of the cyclic auto-correlation function estimates formed from the measured ...
Songsri Sirianunpiboon, Stephen D. Howard, Douglas Cochran   +2 more
openaire   +1 more source