Results 171 to 180 of about 1,799 (215)

Coherent signal - subspace processing in a sector

Twenty-Third Asilomar Conference on Signals, Systems and Computers, 1989., 1989
The determination of the number of wideband signals impinging on a passive sensor array in the form of multiple groups (clusters), and the estimation of their directions of arrival is addressed. The idea of preprocessing by a set of orthogonal beamformers for dimensionality reduction is used to simplify wideband processing.
Antonios Bassias, Mostafa Kaveh
openaire   +1 more source

Modeling the Coherence of Scattered Signals of Opportunity

IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium, 2019
The reflection of radar echoes collected under both monostatic and bistatic configurations generally undergoes losses of coherence. These can be affected by many factors, depending on both the system features and the illuminated surface, and it should be properly considered for an accurate characterization of the scattering phenomenon.
Comite D., Dente L., Guerriero L., Pierdicca N.   +3 more
openaire   +1 more source

Generalized Coherence-Based Signal Enhancement

ICASSP 2020 - 2020 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2020
This contribution presents a novel approach for coherence-based signal enhancement. An estimator for the coherent-to-diffuse ratio (CDR) is devised, which exploits the concept of generalized magnitude coherence and thus, unlike common state-of-the-art schemes, can simultaneously take advantage of more than two microphones.
Heinrich W. Löllmann, Andreas Brendel, Walter Kellermann   +2 more
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

Self-Coherent Receiver for PolMUX Coherent Signals

Optical Fiber Communication Conference/National Fiber Optic Engineers Conference 2011, 2011
A compact polarization-diversity self-coherent receiver with reduced complexity is proposed. Requirements on input polarization tracking is relaxed by a variant CMA equalizer. Ex-periments are performed for 50 and 100 Gb/s PolMUX-NRZ-QPSK signals.
Li, J., Schmidt-Langhorst, C., Schmogrow, R., Hillerkuss, D., Lauermann, M., Winter, M., Worms, K., Schubert, C., Koos, C., Freude, W., Leuthold, J.   +10 more
openaire   +1 more source

Adaptive beamforming for coherent signals and interference

IEEE Transactions on Acoustics, Speech, and Signal Processing, 1985
In this paper we introduce a new adaptive array beam-former able to work well even when the desired signal and the interference are coherent. The present adaptive beamformers fail to operate in these cases. The results of simulations support the theoretical predictions.
Tie-Jun Shan, Thomas Kailath
openaire   +1 more source

Optimum beamforming for coherent signal and interferences

IEEE Transactions on Acoustics, Speech, and Signal Processing, 1988
An approach is described to optimum beamforming in the presence of correlated interferences completely overcoming the signal cancellation phenomenon. In contrast with classical adaptive beamforming where no assumptions are made on the statistical properties of the interference and noise, other than their being uncorrelated with the desired signal, the ...
Yoram Bresler, Vellenki Umapathi Reddy, Thomas Kailath   +2 more
openaire   +1 more source

DOA Estimation of Coherent NLFM Signals

2011 Seventh International Conference on Intelligent Information Hiding and Multimedia Signal Processing, 2011
As the prevalence of broadband coherent sources, a novel algorithm for the direction of arrival (DOA) estimation of coherent signals based on DPT and virtual array is introduced. And one of the algorithms is to be done a comparison, analysis and improvement. It can settle the problem of not finding coherent signals in routine algorithm.
Chunxia Gao, Tianqi Zhang, Fangqing Tan, Chao Wang   +3 more
openaire   +1 more source

On maximum-likelihood localization of coherent signals

IEEE Transactions on Signal Processing, 1996
We consider the problem of localizing multiple signal sources in the special case where all the signals are known a priori to be coherent. A maximum-likelihood estimator (MLE) is constructed for this special case, and its asymptotical performance is analyzed via the Cramer-Rao bound (CRB). It is proved that the CRB for this case is identical to the CRB
Jacob Sheinvald, Mati Wax, Anthony J. Weiss   +2 more
openaire   +1 more source

New adaptive processor for coherent signals and interference

ICASSP '84. IEEE International Conference on Acoustics, Speech, and Signal Processing, 1984
In this paper we introduce a new adaptive processor able to work well even when the desired signal and the interference are coherent. The present adaptive processors fail to operate in these cases. The results of simulations appear to confirm the theoretical predictions.
Tie-Jun Shan, Thomas Kailath
openaire   +1 more source