Search Results

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

“FY 1999 Technical Progress Report,” Technical Progress Report, January 2000

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...

Steven K. Jones, Robert L. Hinkle, Frank H. Sanders, and Bradley J. Ramsey, “Technical Characteristics of Radiolocation Systems Operating in the 3.1–3.7 GHz Band and Procedures for Assessing EMC with Fixed Earth Station Receivers,” Technical Report NTIA TR 99-361, December 1999

In recent years, there has been a significant increase in the number of reported cases of electromagnetic interference (EMI) to 3.7–4.2 GHz FSS earth stations from radar stations operating in the 3.1–.7 GHz band. The increase in reported interfere...

Frank H. Sanders, “Measured Occupancy of 5850–5925 MHz and Adjacent 5-GHz Spectrum in the United States,” Technical Report NTIA TR-00-373, December 1999

Dedicated short-range communication (DSRC) systems have been proposed for operation at locations across the United States in the 5850 to 5925 MHz band. To establish electromagnetic compatibility between DSRC and other 5-GHz systems, it is necessary t...

Michael G. Cotton, Robert J. Achatz, Yeh Lo, and Christopher L. Holloway, “Indoor Polarization and Directivity Measurements at 5.8 GHz,” Technical Report NTIA TR-00-372, November 1999

This report investigates how antenna polarization and directivity affect indoor radio channel bandwidth and signal coverage. Indoor impulse response measurements were taken at 5.8 GHz for four canonical propagation conditions: within a room, down a c...

Robert L. Sole, Brent L. Bedford, and Gary M. Patrick, “Lower Mississippi River Ports and Waterways Safety System (PAWSS) RF Coverage Test Results,” Technical Report NTIA TR 00-374, November 1999

The Coast Guard plans to operate an Automatic Identification System (AIS) Digital Selective Calling (DSC) based transponder system as part of the Ports and Waterways Safety System (PAWSS) in the lower Mississippi River. The AIS uses two duplex channe...

Robert L. Sole and Brent L. Bedford, “Evaluation of Marine VHF Radios: Compliance to IEC Receiver Standards,” Technical Report NTIA TR-99-363, October 1999

Mariners in the United States and other countries are experiencing interference on channels allocated to the above functions. The Radio Technical Commission for Maritime Services (RTCM) established Special Committee 117 to investigate the interferenc...

Edmund A. Quincy et al., “Radio Link Performance Prediction via Software Simulation,” Technical Report NTIA TR-00-371, October 1999

The subjective quality of speech and image information, transmitted over a high frequency radio link impaired with varying levels of interference, has been evaluated using software simulation. The high frequency radio link was also degraded by frequ...

Stephen Wolf and Margaret H. Pinson, “Spatial-Temporal Distortion Metrics for In-Service Quality Monitoring of Any Digital Video System,” Conference Paper, September 1999

Many organizations have focused on developing digital video quality metrics which produce results that accurately emulate subjective responses. However, to be widely applicable a metric must also work over a wide range of quality, and be useful for i...

John M. Vanderau and Eldon J. Haakinson, “An Evaluation of the Proposed Railroad VHF Band Channel Plan,” Technical Report NTIA TR-99-370, September 1999

As a result of the Federal Communications Commission’s radio spectrum realignment initiative, land mobile radio manufacturers are being encouraged to incorporate narrowband and trunking technologies into their designs in order to efficiently utilize ...

Christopher L. Holloway and Roger A. Dalke, “Proceedings of the International Symposium on Advanced Radio Technologies September 8–10, 1999,” Conference Proceedings, September 1999

The 1999 International Symposium on Advanced Radio Technologies focused on state-of-the-art and future trends in satellite communication technologies and applications. Session presentations by leading experts in satellite communications from governm...

Perry F. Wilson, Peter B. Papazian, Michael G. Cotton, and Yeh Lo, “Advanced Antenna Test Bed Characterization for Wideband Wireless Communication Systems,” Technical Report NTIA TR-99-369, August 1999

An advanced antenna test bed for evaluating adaptive antennas and next-generation mobile communication systems is described. The key elements of the data acquisition system are 8 simultaneous channels, broadband impulse channel sounding, high speed ...

Nicholas DeMinco, “Medium Frequency propagation prediction techniques and antenna modeling for Intelligent Transportation Systems (ITS) broadcast applications,” Technical Report NTIA TR-99-368, August 1999

This paper discusses the basic aspects of radio-wave propagation and antenna modeling in the medium frequency (MF) band. This band covers the frequencies of 300 to 3000 kHz. More specifically, we are concerned with the ground wave and the sky wave in...

Frank H. Sanders, Bradley J. Ramsey, and Vincent S. Lawrence, “Broadband Spectrum Survey at San Francisco, California May–June 1995,” Technical Report NTIA TR-99-367, July 1999

The National Telecommunications and Information Administration (NTIA) is responsible for managing the Federal Government’s use of the radio spectrum. In discharging this responsibility, NTIA funds the Institute for Telecommunication Sciences (ITS) ra...

Stephen D. Voran, “Objective Estimation of Perceived Speech Quality, Part 1: Development of the Measuring Normalizing Block Technique,” Journal Article, July 1999

Perceived speech quality is most directly measured by subjective listening tests. These tests are often slow and expensive, and numerous attempts have been made to supplement them with objective estimators of perceived speech quality. These attempts...

Stephen D. Voran, “Objective Estimation of Perceived Speech Quality, Part 2: Evaluation of the Measuring Normalizing Block Technique,” Journal Article, July 1999

Part 1 of this paper describes a new approach to the objective estimation of perceived speech quality. This new approach uses a simple but effective perceptual transformation and a distance measure that consists of a hierarchy of measuring normalizin...

Christopher L. Holloway, Michael G. Cotton, and Paul M. McKenna, “A Model for Predicting the Power Delay Profile Characteristics Inside a Room,” Journal Article, July 1999

Multipath effects in indoor wireless communication systems exhibit a characteristic power delay profile (PDP) and can be a detriment to the system's performance. We present a simplified model for calculating the decay rate of the PDP for propagation ...

Robert L. Sole and Brent L. Bedford, “Lower Mississippi River VTS Frequency Survey,” Technical Report NTIA TR-99-364, June 1999

The maritime mobile frequency band supports maritime communications worldwide. Appendix 18 of the ITU Radio Regulations (RR) defines the channels of the maritime mobile service. These channels support a variety of communication functions including...

Stephen D. Voran, “Advances in Objective Estimation of Perceived Speech Quality,” Conference Paper, June 1999

We present two techniques that can be used to enhance objective estimators of perceived speech quality. Frame normalization and frame-energy plane partitioning are described and applied to a log-spectral-error-based estimator. The resulting estimator...

Roger A. Dalke, Patricia J. Raush, Frank H. Sanders, and Jeanne M. Ratzloff, “Spectrum Measurements for an RF–Driven Lighting Device,” Technical Report NTIA TR-99-366, May 1999

New lighting devices that emit radio frequencies are being developed for commercial use. Since such devices may interfere with communication systems that utilize the radio spectrum, it is essential that the emission characteristics be carefully anal...

Margaret H. Pinson and Stephen Wolf, “Medium Bandwidth Techniques for Estimating Temporal Delays Between Input and Output Video Sequences,” Technical Contribution, May 1999

This contribution presents new techniques for estimating temporal delays between input and output video streams from video teleconferencing systems. The discussion in this contribution considers "variable alignment," defined as an alignment process t...