Results 181 to 190 of about 43,924 (217)

The Multipath Propagation Problem

1997
The properties and principles outlined so far in respect of cellular radio would appear to show that a roaming radiotelephone system can be set up quite specifically. Radio coverage in a cell can be well defined; co-channel interference from adjacent cells can likewise be defined; analog voice with FM operates in an assured manner; signalling over the ...
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Evaluation of multipath error and signal propagation in a complex scenario for GPS multipath identification

Proceedings of ISSSTA'95 International Symposium on Spread Spectrum Techniques and Applications, 2002
For precise GPS kinematic positioning one major source of error is the multipath signal propagation. Therefore, it is very important to get more information about the possible multipath signals in a complex scenario. With a simulation it is possible to predict a multipath signal propagation and the corresponding error in the code and carrier beat phase.
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Influence of multipath propagation on UWB imagery

2008 IEEE International Conference on Ultra-Wideband, 2008
In this paper the influence of multipath propagation on the quality of UWB imagery is analyzed. Typical UWB imaging methods like time domain migration consider only propagation paths with one reflection at the object of interest. In most scenarios the paths of higher order are attenuated sufficiently to neglect them.
Malgorzata Porebska, Christian Sturm, Jens Timmermann, Thomas Zwick, Werner Wiesbeck   +4 more
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Spatial matched processing for multipath propagation

The Journal of the Acoustical Society of America, 1987
Underwater acoustic propagation is characterized by multipath or multimode propagation. Ray theory and mode theory are not fully adequate for modeling physical reality. Impulse responses can be more accurately calculated using Gaussian beam theory.
Matthew Dzieciuch, T. G. Birdsall
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Multipath propagation in mobile communications

2003
When a receiver is moving in a complicated, multipath environment, it is continuously receiving new contributions with changes in delay, amplitude and polarisation. The problem of exactly analysing the multipath problem is a formidable task, but is usually one without interest.
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Multipath fading of on-body propagation channels

2008 IEEE Antennas and Propagation Society International Symposium, 2008
It was shown that multipath fading of an on-body channel can be characterized by a Rician distribution. The parameters of the Rican distribution for two on-body channels were extracted and their behavior during walking movement in an office and in an anechoic chamber was analyzed.
Y.I. Nechayev, P.S. Hall
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Wireless System with Multipath Propagation

2018
In particular, for broadband applications, where the signal bandwidth is a noticeable fraction of the carrier frequency and where sophisticated modulation and detection methods have to be used, the receiver does not only require a sufficient mean power but also a reasonable approximation of the impulse response \(w_{e}(t,s)\) or delay spread function \(
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Reverberation for Multipath Propagation in Urban Areas

The Journal of the Acoustical Society of America, 1973
The propagation of urban noise combines the transmission phenomena of reflection, scattering, and shielding to produce sound levels that are substantially different from those that would exist in an open terrain situation. When the source is elevated, the number of important contributing paths is generally less than four or five, and the reverberation ...
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Raypath parameters in tropospheric multipath propagation

IEEE Transactions on Antennas and Propagation, 1982
An analytic approach tO the modeling of refractivity profiles, together with ray-tracing considerations, is discussed with a view to providing relevant information regarding path parameters in a multipath situation. Some points arising from rays launched from within an elevated duct are raised and discussed.
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Identifying and Modelling Multipath Clusters in Propagation Measurement Data

2010 IEEE 72nd Vehicular Technology Conference - Fall, 2010
In this paper, a new algorithm that is able to identify and track multipath clusters in the delay-angular domain is introduced. The introduced algorithm avoids calculations of a single distance measure from quantities with different nature; instead it performs the clustering via extracting multiple 1D waveforms from the 2D delay-angular domain.
Ghassan S. Dahman, Robert J. C. Bultitude, Roshdy H. M. Hafez   +2 more
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