Results 231 to 240 of about 1,512,339 (290)

The Indoor Radio Propagation Channel

Proceedings of the IEEE, 1993
In this tutorial survey the principles of radio propagation in indoor environments are reviewed. The channel is modeled as a linear time-varying filter at each location in the three-dimensional space, and the properties of the filter's impulse response are described. Theoretical distributions of the sequences of arrival times, amplitudes and phases are
H Hashemi
exaly   +2 more sources

Tropospheric Radio Propagation Assessment

Proceedings of the IEEE, 1985
The status of tropospheric radio propagation assessment is reviewed and recent advances in this area are described. Special emphasis is given to anomalous propagation in a marine environment. Modeling and measurements of ducting phenomena caused by the oceanic evaporation duct and by elevated refractive layers are discussed.
Herbert V. Hitney, Jürgen H. Richter, Richard A. Pappert, Kenneth D. Anderson, Gerald B. Jr. Baumgartner   +4 more
exaly   +2 more sources

Propagation Issues for Cognitive Radio

Proceedings of the IEEE, 2009
Cognitive radios are expected to work in bands below about 3.5 GHz and may be used for a variety of applications, e.g., broadband fixed wireless access, mobile and nomadic access, etc. Cognitive radio system designers must have access to a wide range of channel models covering a wide span of operating frequencies, carrier bandwidths, deployment ...
Andreas F. Molisch, Mansoor Shafi, Larry J Greenstein   +2 more
exaly   +3 more sources

Radio Propagation at 900 MHz in Underground Coal Mines

IEEE Transactions on Antennas and Propagation, 2001
This paper reports on experimental results of radio propagation in two underground coal mines. Measurements were performed at 900 MHz on horizontal and vertical polarization in typical coal mine operational zones.
Y P Zhang
exaly   +2 more sources

Inbuilding prediction [radio propagation]

Proceedings of PIMRC '96 - 7th International Symposium on Personal, Indoor, and Mobile Communications, 2002
Potential implementation of wireless radio local area networks and personal communication services inside buildings require a thorough understanding of signal propagation within a building. In this paper an inbuilding prediction tool is presented. It uses a more simplified method than the ray tracing method.
William C. Y. Lee, David J. Y. Lee
openaire   +2 more sources

The propagation of a radio atmospheric

Proceedings of the IEE - Part B: Radio and Electronic Engineering, 1956
On the assumption that the space between the earth and the ionosphere acts as a waveguide, the mechanism of propagation of an atmospheric has been considered from the viewpoint of plane-wave reflections. The pulse at the origin has been assumed to be rectangular and of duration 100 microsec.
openaire   +1 more source

Appendix: Radio propagation and radio noise

1999
When a spectrum manager is making a frequency assignment it may be necessary to estimate the minimum transmitter power level that is consistent with the achievement of specified link performance objectives. It is seldom feasible to use direct measure ments for this purpose.
openaire   +1 more source

Propagation of Radio Waves

1978
We summarized in Chapter I the character of the interaction with the atmosphere of that part of the electromagnetic spectrum capable of exciting transitions in individual neutral molecules. Longer wavelengths in the electromagnetic spectrum (microwaves) do not correspond to any strong interaction, whence a large transparent ‘window’ put to good use by ...
Alain Giraud, Michel Petit
openaire   +1 more source

Radio waves and propagation

2003
This chapter discusses properties of radio waves and their propagation. Radio waves are a form of radiation known as electromagnetic waves. The properties of radio waves and the way in which they travel or propagate are of prime importance in the study of radio technology.
openaire   +1 more source

Radio Wave Propagation

AIP Conference Proceedings, 2007
Electromagnetic radio waves traveling within earth’s atmosphere are called terrestrial waves, and communications between two or more points on earth is called terrestrial radio communications. Terrestrial waves are influenced by the atmosphere and earth itself.
openaire   +1 more source