Search Results

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

Coleen T. Jones and Ned Crow, “Status of NTIA's Analysis of Subjective Data,” Technical Contribution, July 1994

Presents results from the analysis of variance (ANOVA) of the subjective opinion scores for the T1A1 subjective video experiment that contained 625 mean opinion scores (25 test scenes passed through 25 different video transmission systems that ranged...

Coleen T. Jones, “The Correlation of Traditional Bandwidth and Signal-to-Noise Ratio Parameters to Subjective Data,” Technical Contribution, July 1994

This contribution presents objective to subjective correlation results for the traditional analog measurements of bandwidth (i.e., frequency response) and signal-to-noise ratio (SNR) for the T1A1 subjective video experiment that contained 625 mean op...

Robert J. Matheson, “A Survey of Relative Spectrum Efficiency of Mobile Voice Communication Systems,” Technical Report NTIA TR-94-311, July 1994

This paper provides definitions of spectrum efficiency for general communication systems, then simplifies the definitions so that the spectrum efficiency of several contemporary mobile radio systems can be easily compared. A variety of systems curren...

Eldon J. Haakinson, Wayne R. Rust, and Martin M. Garrity, “An Evaluation of the North American Advanced Train Control System,” Technical Report NTIA TR-94-312, July 1994

The railroad industry has proposed an advanced system for train control. This report presents an evaluation of the system development process, with particular emphasis on the data communication system that interconnects dispatch centers, locomotives,...

Frank H. Sanders, Robert L. Hinkle, and Bradley J. Ramsey, “Analysis of Electromagnetic Compatibility Between Radar Stations and 4 GHz Fixed-Satellite Earth Stations,” Technical Report NTIA TR-94-313, July 1994

The susceptibility of 3700 to 4200 MHz fixed-satellite service earth stations to interference from radar signals, and the mechanisms by which such interference can occur, are examined. It is shown that interference can occur even if all currently app...

Jeffery A. Wepman, J. Randy Hoffman, and Lynette H. Loew, “Impulse Response Measurements in the 1850–1990 MHz Band in Large Outdoor Cells,” Technical Report NTIA TR-94-309, June 1994

Mobile impulse response measurements were taken in the 1850–1990 MHz band in three different macrocellular (cell radii of 5 km) environments: flat rural, hilly rural, and urban high-rise. Spatial diversity with a 15-wavelength separation was employed...

Eric E. Johnson and David F. Peach, “High-frequency radio channel error model,” Technical Report NTIA TR-94-310, June 1994

Simulation has been extensively employed to evaluate concepts included in the current generation of standards for automated high–frequency (HF) radio systems. As development proceeds from link–layer technology to network– and higher–layer technology,...

Eric E. Johnson, David F. Peach, and Robert T. Adair, “A Software Simulator for High Frequency Radio Automatic Link Establishment,” Technical Memorandum NTIA TM-94-162, May 1994

Kenneth C. Allen et al., “Building Penetration Loss Measurements at 900 MHz, 11.4 GHz, and 28.8 GHz,” Technical Report NTIA TR-94-306, May 1994

The feasibility of using radio frequencies in the super high frequency (SHF) band (3-30 GHz) for Personal Communications Services (PCS) in buildings depends on the multipath within the structure and the amount of attenuation experienced by the electr...

Wayne R. Rust and Eldon J. Haakinson, “U.S. Department of Agriculture Forest Service Eastern Region Strategic Telecommunication Plan 1994-2003,” Technical Report NTIA TR-94-307, May 1994

This report documents the development of a telecommunication strategy for 1994-2003 for the Eastern Region of the U.S. Department of Agriculture Forest Service. The Institute for Telecommunication Sciences (ITS) identified telecommunication needs, as...

David F. Peach and Michael D. Meister, “An Assessment of the U.S. Telecommunications Industry Dependence on Foreign Sources as it Impacts the U.S. Telecommunications Infrastructure,” Technical Report NTIA TR-94-305, April 1994

The National Communications System (NCS) is responsible for defining operational infrastructures and processes that could be detrimental to the provision of telecommunications equipment and services necessary to the National Security and Emergency Pr...

Edwin L. Crow, “Methods for Analysis of Inter-laboratory Video Performance Standard Subjective Test Data,” Technical Contribution, March 1994

Presents in detail the ANOVA methods for analysis of the subjective T1A1 video test data, especially with regard to any systematic effect a laboratory may have on the Mean Opinion Score (MOS) of any given Hypothetical Reference Circuit (HRC). The ter...

Daniel Law, Frank H. Sanders, Gary M. Patrick, and Michael Richmond, “Measurements of Wind Profiler EMC Characteristics,” Technical Report NTIA TR-93-301, March 1994

This report provides the results of measurements that were conducted on a 404.37 MHz wind profiler located in Platteville, Colorado. These measurements included: radiated spectra (both high and low mode), radiated harmonic and subharmonic power meas...

Philip E. Gawthrop, Frank H. Sanders, Karl B. Nebbia, and John J. Sell, “Radio Spectrum Measurements of Individual Microwave Ovens, Volumes 1 and 2,” Technical Report NTIA TR-94-303, March 1994

This report provides results of radio spectrum measurements of 13 individual microwave ovens performed at the National Telecommunications and Information Administration (NTIA) Institute for Telecommunication Sciences (ITS). Measurements include emis...

Paul C. Smith, Robert T. Adair, and David F. Peach, “An investigation of Federal Standard 1045 High–Frequency ALE Radio Performance in the Southern Trans–Auroral Zone,” Technical Report NTIA TR-94-304, March 1994

This report presents the results of two weeks of bi–directional high frequency radio path soundings in a trans–auroral environment between Christchurch, New Zealand, and the U.S. station, McMurdo (Black Island), Antarctica, during mid–January, 1992. ...

Marjorie L. Weibel, “Test Plan for Experiments to Provide Preliminary Characterization of ACTS Performance,” Technical Memorandum NTIA TM-94-161, February 1994

Stephen Wolf and Margaret H. Pinson, “Corrections and Extensions to T1A1.5/93-152,” Technical Contribution, January 1994

Contribution T1A1.5/93-152 summarized the methods of measurement for objective video quality parameters based on the Sobel-filtered image and the motion difference image that were submitted prior to conducting the T1A1 subjective experiment (this exp...

Arthur A. Webster and Coleen T. Jones, “VTC Hypothetical Reference Circuit Signal to Noise Ratio Measurements,” Technical Contribution, January 1994

Discusses the method of measurement used to obtain the signal to noise ratio (SNR) values for each of the twenty-five video systems in the T1A1 subjective video experiment. The 25 video systems ranged in bit rate from 64 kb/sec to 45 Mb/sec. The sign...

Coleen T. Jones, “VTC Hypothetical Reference Circuit Bandwidth Measurements,” Technical Contribution, January 1994

Discusses the method of measurement used to obtain the frequency response or bandwidth values for each of the twenty-five video systems in the T1A1 subjective video experiment. The 25 video systems ranged in bit rate from 64 kb/sec to 45 Mb/sec. The ...

William D. Speights, Ernesto A. Cerezo, Richard J. Orsulak, and Robert C. Wilson, “National Land Mobile Radio Spectrum Requirements,” Technical Memorandum NTIA TM-94-160, January 1994

The National Land Mobile Spectrum Requirements report was released in January 1994. This report describes the Federal Government's land mobile radio (LMR) usage and trends in the following bands: 30–50, 138–150.8, 162–174, 220–222 and 406.1–420 MHz....