Search Results

The search returned 1,243 publication(s) on its.ntia.gov.

“FY 1976 Technical Progress Report,” Technical Progress Report, January 1977

The Institute for Telecommunication Sciences (ITS) is the research and engineering laboratory of the National Telecommunications and Information Administration (NTIA) of the U.S. Department of Commerce (DOC). ITS provides technical support to NTIA in...

Harold T. Dougherty and Burgette A. Hart, “Anomalous Propagation and Interference Fields,” Technical Report OT-76-107, December 1976

This report presents some estimates of the enhanced fields deduced from the presently available theory and observational data. The fields of interest are the enhanced fields that are encountered in the presence of the stratified atmosphere, the duct...

Science and Technology Telecommunications Task Force, U. S. Department of Commerce, “Lowering Barriers to Telecommunications Growth,” eds. Douglass D. Crombie, Special Publication OT-SP-76-9, November 1976

The report briefly summarizes the status of four technologies: direct satellite communications, land mobile radio, broadband communications networks, and fiber optic communications. It considers the problems that appear to be hindering the growth of...

Institute for Telecommunication Sciences, “Proceedings of the Fifth Annual Telecommunications for Government Workshop,” Conference Proceedings, October 1976

The Office of Telecommunications "Telecommunications for Government" conference provides a forum for discussion of selected telecommunications applied research/engineering efforts by representatives of Government Agencies. Current research programs ...

Moody C. Thompson Jr., Randolph H. Ott, and Edmond J. Violette, “Report on 1976 Millimeter-Wave Conference,” Special Publication OT-SP-76-11, September 1976

On March 2, 3, and 4, 1976, the Institute for Telecommunication Sciences of the Office of Telecommunications, U. S. Department of Commerce, sponsored a conference on "The Use of Millimeter Waves for Communications." The purpose of the meeting was to...

John R. Juroshek and G. E. Wasson, “Measurements of Digital Systems in Gaussian Additive Noise and Interference,” Technical Report OT 76-104, September 1976

A series of experimental measurements are described that examine the performance of the five different digital modems in Gaussian noise and additive interference. These experimental results are then compared with theoretical predictions to determine...

Robert F. Linfield, Robert W. Hubbard, and Lauren E. Pratt, “Transmission Channel Characterization by Impulse Response Measurements,” Technical Report OT 76-96, August 1976

Some basic concepts, design criteria, and hardware implementations are reviewed for measuring the impulse responses which characterize radio transmission channels. A channel sounder which is presently being used by the Institute for Telecommunicatio...

Ernest K. Smith, “World Maps of Sporadic E (foEs > 7 MHz) for Use in Prediction of VHF Oblique-Incidence Propagation,” Special Publication OT-SP-76-10, June 1976

S. I. Cohn, C. P. Jacobs, and W. M. Moran, “Fixed Radar Spectrum Utilization Model,” Technical Note TN-76-3, June 1976

This report contains a description of the Fixed Radar Spectrum Utilization Model. This model is automated and can be used to obtain: (1) a measure of spectrum crowding in a specific geographic area and radar frequency band, (2) a list of preferable ...

Anita G. Longley, “Location Variability of Transmission Loss Land Mobile and Broadcast Systems,” Technical Report OT 76-87, May 1976

This report summarizes the results of a number of studies of path-to-path, or location, variability of transmission loss at 20 MHz to 10 GHz. The studies show that such variability appears to be normally distributed and can, therefore, be represente...

Robert W. Hubbard, “Characteristics and Applications of a PN Channel Probe,” Technical Memorandum OT TM 76-218, May 1976

This report describes and illustrates the method, instrumentation and applications of a probing technique for measuring fundamental characteristics of a radio model transmission channel. The method is based upon a convolutional model of the channel,...

David Middleton, “Statistical-Physical Models of Man-Made and Natural Radio Noise Part II: First Order Probability Models of the Envelope and Phase,” Technical Report OT-76-86, April 1976

Most man-made and natural electromagnetic interferences are highly non-gaussian random processes, whose degrading effects on system performance can be severe, particularly on most conventional systems, which are designed for optimal or near optimal ...

Raymond D. Jennings, Lewis E. Vogler, and Judith J. Stephenson, “Statistical Frequency-Distance Curves, Initial Model,” Technical Report OT-76-84, April 1976

This report describes an initial computer program that produces statistical frequency-distance curves. The computer program has been developed as a tool for use by the frequency managers' community of OTP/IRAC. The statistical frequency-distance curv...

Mary P. Fackelman and Kimberly A. Krekel, “International Telecommunications Bibliography,” Special Publication OT SP-76-7, March 1976

The bibliography is a reference guide that cites and annotates over 400 articles on various aspects of telecommunications. Articles are relevant to U.S. policy in communications, and range from specific technologies and systems worldwide, to economi...

John R. Juroshek, “Performance of Digital Modems with Co-channel Interference and Gaussian Noise,” Technical Report OT 76-82, February 1976

An approximate method for estimating the performance of digital systems operating with co-channel interference and Gaussian additive noise is described. The method uses Monte-Carlo techniques and an approximation, based on the geometrical characteri...

Donald V. Glen, Earl C. Bolton, James C. Blair, and Peter M. McManamon, “Circuit Status for Multiple-Satellite-Hop User Reaction Tests,” Special Publication OT-SP-76-8, January 1976

These user reaction tests involved voice telephone communications that were relayed one, two, or three times through the Westar satellite. The types of connections for the voice transmissions involved Common Control Switching Arrangements

George A. Codding Jr., “The U.S. and the I.T.U. in a Changing World,” Special Publication OT SP-75-6, December 1975

This paper by Professor George A. Codding, a recognized authority on the International Telecommunication Union, was originally given as an invited talk at the 4th Telecommunications for Government Conference held in Boulder, Colorado, November 11–13...

Institute for Telecommunication Sciences, “Proceedings of the Fourth Annual Telecommunications for Government Workshop,” Conference Proceedings, November 1975

The Office of Telecommunications "Telecommunications for Government" conference provides a forum for discussion of selected telecommunications applied research/engineering efforts by representatives of Government Agencies. Current research programs ...

R. Michael Jones and Judith J. Stephenson, “A Versatile Three-Dimensional Ray Tracing Computer Program for Radio Waves in the Ionosphere,” Technical Report OT-75-76, October 1975

This report documents the latest version of the three-dimensional ray tracing program originally described in “A Three-Dimensional Ray Tracing Computer Program,” by R. M. Jones, ESSA Technical Report IER 17 - ITSA 17, and later modified in “Modifica...

Anita G. Longley and George A. Hufford, “Sensor Path Loss Measurements Analysis and Comparison with Propagation Models,” Technical Report OT-75-74, October 1975

The data from a large measurement program at VHF and UHF are carefully evaluated , summarized and compared with values predicted from models of radio propagation over irregular terrain. Particular problems of low antennas and the effects of vegetati...