Search Results

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

“FY 2002 Technical Progress Report,” Technical Progress Report, December 2002

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 Channel-Optimized Multiple-Description Scalar Quantizer,” Conference Paper, October 2002

Multiple–description coding is one way to gain robustness against lossy channels. We extend the multiple–description scalar quantizer (MDSQ) to a channel–optimized MDSQ (COMDSQ) that minimizes mean–squared error for a given channel environment. We di...

Stephen D. Voran, “An Iterated Nested Least-Squares Algorithm for Fitting Multiple Data Sets,” Technical Memorandum NTIA TM-03-397, October 2002

A multiple data set fitting problem often arises in conjunction with the development of objective estimators of perceived audio or video quality. In such development work, we often seek the best linear relationship between a set of objective audio o...

Stephen D. Voran, “Compensating for System Gain: Motivations, Derivations, and Relations for Three Common Solutions,” Technical Memorandum NTIA TM-03-398, October 2002

It is often desirable to compensate for system gain, especially before objectively estimating perceived audio or video quality from system inputs and outputs. A common approach is to scale the system output to compensate for system gain. One can tak...

Stephen D. Voran, “Estimation of system gain and bias using noisy observations with known noise power ratio,” Technical Report NTIA TR-02-395, September 2002

The identification of linear systems from input and output observations is an important and well-studied topic. When both the input and output observations are noisy, the resulting problem is sometimes called the "errors in variables" problem. Exist...

Michael G. Cotton, Edward F. Kuester, and Christopher L. Holloway, “An Investigation Into the Geometric Optics Approximation for Indoor Scenarios with a Discussion on Pseudolateral Waves,” Journal Article, July 2002

In this study we investigated the geometric optics (GO) approximation to the fields of an infinitesimal electric dipole above a half plane for geometries typical of wireless indoor communications. This inspection was motivated by efforts to establis...

Stephen Wolf and Margaret H. Pinson, “Video Quality Measurement Techniques,” Technical Report NTIA TR-02-392, June 2002

Objective metrics for measuring digital video performance are required by Government and industry for specification of system performance requirements, comparison of competing service offerings, service level agreements, network maintenance, and opt...

John J. Lemmon, “Wireless Link Statistical Bit Error Model,” Technical Report NTIA TR-02-394, June 2002

A bit error model that enables simulations of the digital error performance of wireless communication links has been developed. The model development has been based on error sequences derived from waveform simulations of wireless link performance wi...

Frank H. Sanders, “Measurements of Pulsed Co-Channel Interference in a 4-GHz Digital Earth Station Receiver,” Technical Report NTIA TR-02-393, May 2002

Pulsed signals in Earth station receiver spectrum bands have traditionally occurred due to unwanted emissions from adjacent-band transmitters such as radars and altimeters. Analog Earth station receivers sometimes experience interference from such e...

Margaret H. Pinson and Stephen Wolf, “Video Quality Measurement User’s Manual,” Handbook NTIA HB-02-01, February 2002

The purpose of this handbook is to provide a user’s manual for the video quality metric (VQM) tool. The VQM software tool performs automated batch processing of video files. Program VQM runs under the UNIX operating system and uses a control file to...

John J. Lemmon and Roger A. Dalke, “Analysis of the RF Threat to Telecommunications Switching Stations and Cellular Base Stations,” Technical Report NTIA TR-02-391, February 2002

The objective of this report is to assess the vulnerability of telecommunications switching stations and cellular base stations to high power electromagnetic radiation generated by an RF device. Analyses, measurements, and simulations of indoor prop...

Robert J. Achatz and Roger A. Dalke, “Man–made noise power measurements at VHF and UHF frequencies,” Technical Report NTIA TR-02-390, December 2001

Man-made noise generated by automotive ignition, power distribution and transmission, industrial equipment, consumer products, and lighting systems degrades the performance of radio systems. Man-made noise models, derived from measurements made in t...

Thomas L. Chirhart, Charles T. Hoffman, Richard J. Orsulak, and Edward F. Drocella Jr., “Alternative Frequencies for Use by Public Safety Systems: Response to Title XVII, Section 1705 of the National Defense Authorization Act for FY2001,” Special Publication NTIA SP 01-48, December 2001

On behalf of the Secretary of Commerce, the National Telecommunications and Information Administration (NTIA) has prepared this report in response to Title XVII, Section 1705 of the National Defense Authorization Act for FY2001. It represents part of...

David S. Anderson, Edward F. Drocella Jr., Steven K. Jones, and Mark A. Settle, “Assessment of Compatibility Between Ultrawideband Systems and Global Positioning System Receivers,” Special Publication NTIA SP 01-47, November 2001

The study described in this report was undertaken by the National Telecommunications and Information Administration (NTIA) in response to a Federal Communications Commission (FCC) Notice of Proposed Rule Making (NPRM) concerning the operation of a ne...

J. Randy Hoffman, Michael G. Cotton, Robert J. Achatz, and Richard N. Statz, “Addendum to NTIA Report 01-384: Measurements to Determine Potential Interference to GPS Receivers from Ultrawideband Transmission Systems,” Technical Report NTIA TR-01-389, September 2001

This addendum to NTIA Report 01-384 describes laboratory measurements on two additional Global Positioning System receivers to quantify the effects of ultrawideband interference on those receivers. The laboratory measurements were performed by inser...

Wael Ashmawi, Roch Guerin, Stephen Wolf, and Margaret H. Pinson, “On the Impact of Policing and Rate Guarantees in Diff-Serv Networks: A Video Streaming Application Perspective,” Conference Paper, August 2001

Over the past few years, there have been a number of proposals aimed at introducing different levels of service in the Internet. One of the more recent proposals is the Differentiated Services (Diff-Serv) architecture, and in this paper we explore ho...

Stephen Wolf and Margaret H. Pinson, “The Relationship Between Performance and Spatial-Temporal Region Size for Reduced-Reference, In-Service Video Quality Monitoring Systems,” Conference Paper, July 2001

This paper presents objective-to-subjective correlation results for a reduced-reference, in-service, video quality monitoring system. This reduced-reference system utilizes quality parameters that are computed by comparing features extracted from spa...

Jeffery A. Wepman and J. Randy Hoffman, “Implementation and Testing of a Software Defined Radio Cellular Base Station Receiver,” Technical Report NTIA TR-01-388, July 2001

Software defined radios (SDR’s) represent a departure from traditional radio design. There is some mystique about what SDR’s are, how they are designed, how they operate, and how performance is determined or verified. This report provides insight in...

Christopher L. Holloway, Frank H. Sanders, and Paul M. McKenna, “Predicted and Measured Field Strengths in the Boulder, Colorado, Area from Two Proposed Terrestrial Digital Television Tower Sites,” Technical Report NTIA TR-01-387 / NIST Technical Note 1519, May 2001

A study was performed to determine the increase in ambient electromagnetic field strengths that would result from a proposal to locate a cluster of terrestrial digital television (DTV) transmission towers in proximity to the Department of Commerce (D...

William J. Ingram and Evelyn M. Gray, “On–line Development of an Interactive Web Glossary,” Technical Report NTIA TR-01-385, April 2001

This report describes the electronic, computer-based processes of creating an on-line, Web-based glossary of telecommunication terms—American National Standard, T1.523-2001, Telecom Glossary 2000. These e-mail processes or Web-based processes consti...