Search Results

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

Robert J. Mayher, John K. Lady, William D. Speights, and R. E. Buss Jr., “Evaluation of Spectrum Management in Poland,” Technical Memorandum NTIA TM-92-156, May 1992

Stephen D. Voran and Stephen Wolf, “Objective Measures of Video Impairment: Analysis of 128 Scenes,” Technical Contribution, March 1992

ATIS Committee T1 contribution to standards project “Analog Interface Performance Specifications for Digital Video Teleconferencing/Video Telephony Service and DS3 Television”

Lewis E. Vogler and James A. Hoffmeyer, “A New Approach to HF Channel Modeling and Simulation. Part 3: Transfer Function,” Technical Report NTIA TR-92-284, March 1992

This is the third in a series of reports which describe a new and unique approach for modeling either narrowband or wideband high frequency (HF) channels. Although narrowband models of the HF channel have existed for many years, they are applicable ...

Ernesto A. Cerezo, “Federal Spectrum Usage of the 1710–1850 and 2200–2290 MHz Bands,” Technical Report NTIA TR-92-285, March 1992

The Spectrum Resource Assessment (SRA) is an integral part of the National Telecommunications and Information Administration (NTIA), Office of Spectrum Management (OSM) long-range planning process related to national and international interests that...

Hans J. Liebe, “Laboratory Measurements of the 60-Ghz O2 Spectrum in Air,” Conference Paper, February 1992

The O2-spectrum of dry air was studied with a resonance spectrometer under controlled laboratory conditions. Key parts of the instrumentation were an automatic network analyzer and a one-port Fabry-Pérot resonator affording an effective path length ...

Stephen D. Voran, “Observations on the T-Reference Condition for Speech Coder Evaluation: SQ 13.92,” Technical Contribution, February 1992

In a Study Group XII (Experts Group on Speech Quality) Contribution dated September 1991, John Rosenberger and Bill Cotton of Bellcore introduced an algorithm for generating temporally correlated distortion on 8 KHz sampled speech data. This distort...

Arthur A. Webster and Stephen Wolf, “Spatial and Temporal Information Measures for Video Quality,” Technical Contribution, January 1992

Presents an overview of metrics that can be used to quantify the amount of spatial and temporal information in a video sequence. By applying the metrics to the input and output video, the amount of spatial and temporal information that is lost by the...

Nancy A. Kuester, “Fading Allowance for Lower Decile SNR Calculations for HF Propagation Models,” Technical Memorandum NTIA TM-92-153, January 1992

Cesar A. Filippi et al., “Accommodation of Broadcast Satellite (sound) and Mobile SatelliteServices in the 2300–2450 MHz Band,” Technical Memorandum NTIA TM-92-154, January 1992

This report provides a feasibility assessment of accommodating the Broadcast Satellite (Sound) Service and a Mobile Satellite Service uplink in the 2300–2450 MHz range. The assessment is based upon measurements by the Institute for Telecommunication ...

Evan J. Dutton, Thomas G. Hoople, and Michael P. Roadifer, “An Analysis of Reception Variability Due to Terrain Multipath on Microwave Common Carrier Links,” Technical Report NTIA TR-92-283, January 1992

The error variability of received PSK (MSK), QAM and QPR modulations on digital microwave common carrier links resulting from transmitted power variations and the dispersive effects of terrain multipath using a two–ray model is analyzed. These result...

Institute for Telecommunication Sciences, “FY 1991 Technical Progress Report,” Technical Progress Report, January 1992

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...

Stephen D. Voran, “The development of objective video quality measures that emulate human perception,” Conference Paper, December 1991

Discusses research efforts to derive objective measures of video quality that emulate human perception. The derivation of these metrics involves the following steps: (1) a set of test scenes in selected and distorted, (2) a set of candidate objective...

Karl B. Nebbia, “Assessment of Technological Forecasting for Use in Spectrum Management,” Technical Memorandum NTIA TM-91-152, December 1991

George A. Hufford and Francis K. Steele, “Tabulations of propagation data over irregular terrain in the 75- to 8400-MHz frequency range Part 5: Virginia,” Technical Report NTIA TR-91-282, December 1991

This is a supplementary fifth part to a series of reports containing tabulations and graphs of transmission loss data resulting from propagation experiments which have emphasized the UHF frequency band. The first four reports described data taken in...

James S. Washburn, Brent L. Bedford, and John R. Godwin, “HF Broadcast SSB Receiver Study: A Program Plan,” Technical Memorandum NTIA TM-91-150, November 1991

A program plan and its rationale are presented to determine estimates of the resources needed to test existing high-frequency (HF) broadcast receivers and to develop a single-sideband (SSB) HF broadcast "low-cost" prototype receiver. The plan include...

Jeanne M. Ratzloff, Gregory R. Hand, and James S. Washburn, “User's Guide and Reference Manual for the Improved High-Frequency Spectrum Use Model,” Technical Memorandum NTIA TM-91-151, November 1991

In light of the decisions made by the Administrative Council of the International Telecommunications Union to postpone the high-frequency (HF) broadcast conference scheduled for 1993 the Institute for Telecommunication Sciences documents its improved...

Martin Nesenbergs, “Simulation of hybrid terrestrial-satellite networks for service restoral and performance efficiency,” Technical Report NTIA TR-91-281, November 1991

Motivated by recognized vulnerabilities of the terrestrial public networks, this report addresses the question whether an appropriate introduction of advanced satellite systems would or would not benefit the telecommunication services for the current...

David Middleton, “Effective Erasure of Magnetic Tapes: 2. Criteria and Models Toward an Effective “Standard”,” Contractor Report NTIA CR-91-43, October 1991

Erasure “standards” employing a saturating field which clips a test sinusoidal so that its 3Qharmonic is 12 dB down from the first harmonic is seen to be incomplete. The probability of (just) detecting the erased signal, under false alarm control, is...

Nancy A. Kuester, “AMOS User's Manual,” Technical Memorandum NTIA TM-91-148, October 1991

Gary M. Patrick and Michael Richmond, “Assessment of the 216–225, 400.15–406, 420–450 MHz Band for Possible Wind Profiler Accommodations,” Technical Report NTIA TR-91-280, September 1991

This report presents an assessment of three candidate bands (216–225, 400.15–406, and 420–450 MHz) for the potential accommodation of Wind Profilers nationally, with consideration worldwide. The approach used to evaluate each band was based on two m...