Search Results

The search returned 1,237 publication(s) on its.ntia.gov.

Robert F. Linfield, “Congestion–Reduction and Service–Restoration Strategies for Telecommunication Networks,” Technical Report NTIA TR-90-257, February 1990

This report covers the first task of a three–task effort designed to explore the potential of using advanced satellite system technologies to enhance the rapid restoration of telecommunication services that may be disrupted due to traffic congestion ...

John J. Sell and Gary Gierhart, “Analysis of Selected Government Spectrum Usage During the 1989 Presidential Inauguration,” Measurement Report NTIA RSMS Operations Report, January 1990

Measurements of Federal land mobile usage, in selected mobile bands, relating to the 1989 Presidential inauguration were made using NTIA’s RSMS Van to assess Government communications requirements for a special event of national importance. This repo...

Institute for Telecommunication Sciences, “FY 1989 Technical Progress Report,” Technical Progress Report, January 1990

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...

James S. Washburn et al., “Planning for Frequency Continuity in HF Broadcasting,” Technical Report NTIA TR-89-254, December 1989

The Second Session of the High Frequency Broadcasting Conference held in Geneva, Switzerland, in February 1987, resolved a need for an improved system to plan the radio frequencies allocated exclusively to the HF broadcasting service. The Final Acts ...

Martin Nesenbergs, “Stand–Alone Terrestrial and Satellite Networks for Nationwide Interoperation of Broadband Networks,” Technical Report NTIA TR-89-253, November 1989

The current status of fiber optic and related broadband terrestrial networks is reviewed. That includes summaries of link and switch capabilities as well as present and future standards for broadband systems. In the domain of communication satellites...

Hans J. Liebe and George A. Hufford, “Modeling Millimeter-wave Propagation Effects in the Atmosphere,” Conference Paper, October 1989

Two millimeter-wave propagation models, called MPM and MZM, are discussed. The first one predicts, at frequencies up to 1000 GHz, loss and delay effects for a nonprecipitating atmosphere. Contributions from dry air and vapor are addressed, as well a...

Martin Nesenbergs, “Image Data Compression Overview: Issues and Partial Solutions,” Technical Report NTIA TR-89-252, October 1989

This report presents an overview of moving image (video) data compression. Because this report deals with a subtask of a major program, a limited number of the most pertinent topics and issues have been addressed. These topics include a listing of hu...

Martin Nesenbergs, Darren L. Smith, and L. Thomas Jones, “Power Spectral Densities for Selected Digital Phase–Continuous MFSK Emissions,” Technical Report NTIA TR-89-250, October 1989

This report is a brief outline and a catalog o full power spectral densities for certain M–ary frequency shift keying waveforms. Spectral equations are displayed in graphical form for easy visualization . The spectra pertain to real signals centered ...

David L. Jones, Richard H. Espeland, and Edmond J. Violette, “Vegetation Loss Measurements at 9.6, 28.8, 57.6, and 96.1 GHz Through a Conifer Orchard in Washington State,” Technical Report NTIA TR-89-251, October 1989

Propagation measurements were made in the Olympic National Forest of Washington state during October 1987 to examine millimeter-wave signal propagation through conifer vegetation. Linearly polarized continuous-wave signals at 9.6. 28.8. 57.6. and 96....

Robin H. Haines and Steven E. Litts, “The SUM Land Mobile Model: Application of the Spectrum Use Measure to the Land Mobile Service,” Technical Report NTIA TR-89-248, September 1989

George A. Hufford and Hans J. Liebe, “Millimeter-Wave Propagation in the Mesosphere,” Technical Report NTIA TR-89-249, September 1989

At heights between 30 and 100 km above Earth, the oxygen absorption lines near 60 GHz together with the geomagnetic field cause the atmosphere to become an anisotropic medium. This report discusses why this is so and how to compute the consequent eff...

Joseph E. Farrow and Susan L. Rothschild, “User–Friendly Software for the Design of Digital Line–of–Sight Radio Links,” Technical Report NTIA TR-89-246, August 1989

This report provides a description of and operating instructions for Digital Line–of–Sight (DLOS) programs. These programs, which run on a desk–top computer, automate the calculations involved in design of line–of–sight microwave radio relay paths. T...

James A. Hoffmeyer and Timothy J. Riley, “Digital European Backbone Performance: A 12–Month Summary for the Frankfurt North Segment,” Technical Report NTIA TR-89-247, August 1989

This report describes the interim results of an 18–month digital microwave transmission network performance and propagation measurement project that was conducted on a portion of the Defense Communications System (DCS) in West Germany. Only the first...

Nicholas DeMinco, “Automated Steerable Nulling Antenna Processor (SNAP) Model,” Technical Report NTIA TR-89-245, July 1989

This report describes an adaptive antenna computer model that simulates the behavior of a steerable–nulling antenna processor (SNAP) in a jamming or interference environment. The model predicts the signal–to– (interference–plus–noise) ratio as a func...

Mary W. Sowers, Gregory R. Hand, and Charles M. Rush, “Monitoring of Harmful Interference to the HF Broadcast Service: IV. Results of the July 1988 Coordinated Monitoring Period,” Technical Report NTIA TR-89-244, June 1989

This is the fourth in a series of reports describing the results of studies to determine the location of sources of harmful interference to the high frequency (HF) broadcasting service. Using observations recorded during the July 1988 monitoring prog...

Hans J. Liebe, “MPM — An Atmospheric Millimeter-wave Propagation Model,” Journal Article, June 1989

A broadband model for complex refractivity is presented to predict propagation effects of loss and delay for the neutral atmosphere at frequencies up to 1000 GHz. Contributions from dry air, water vapor, suspended water droplets (haze, fog, cloud), a...

Robert L. Hinkle and Andrew Farrar, “Spectrum-Conservation Techniques for Fixed Microwave Systems,” Technical Report NTIA TR-89-243, May 1989

Since the spectrum is a limited natural resource, the spectrum management community has a major interest in identifying spectrum conservation techniques that will provide more efficient spectrum utilization. Advances in new technology for fixed micro...

William E. Frazier, “Handbook of Radio Wave Propagation Loss, Part ll (100–20,000 MHz),” Handbook NTIA HB-89-242, April 1989

This handbook is intended to provide estimates of radio wave propagation loss between transmitting and receiving antennas of various heights and transmission frequencies above the assumed smooth–earth surface calculated using the NLAMBDA computer mod...

David J. Cohen, William B. Grant, and Francis K. Steele, “Meteor Burst System Communications Compatibility,” Technical Report NTIA TR-89-241, March 1989

The technical and operating characteristics of meteor burst systems of importance for spectrum management applications are identified. A technical assessment is included which identifies the most appropriate frequency subbands within the VHF spectrum...

Cesar A. Filippi, Steven E. Litts, Mary Jo Clarke, and Robert Gruendl, “Single and Aggregate Emission Level Models for Interference Analysis,” Technical Memorandum NTIA TM-89-139, March 1989

This report describes analysis models and software packages developed by the National Telecommunications and Information Administration (NTIA) for the assessment of single-entry and aggregate interference from terrestrial emitters into terrestrial or...