Search Results
The search returned 1,237 publication(s) on its.ntia.gov.
This contribution presents a new technique for estimating temporal delays between input and output video streams from video teleconferencing systems. The discussion in this contribution is limited to "constant alignment," defined as an alignment proc...
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:...
Federal Standard 1037C, Glossary of Telecommunication Terms, contains more than 5800 entries defining the components of several disciplines in telecommunications technology. Use of this large glossary is enhanced with the search engine designed speci...
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 ...
This white paper documents the algorithm of the ITM (the Irregular Terrain Model) as implemented in 1999. There are probably, however, some features of the model that are not documented here but present in the original Fortran source code. The purpo...
The transmission of E-mail over high-frequency (HF) radio channels is experiencing widespread use in the Government and military communities. This ability is made possible through the convergence of Internet and radio communication protocols, primari...
With the advent of new digital video systems that utilize compression to achieve a savings in transmission or storage bandwidth, the quality of the received output video can be dependent not only upon the inherent spatial and temporal information con...
Dedicated short-range communication (DSRC) systems, designed to enhance the efficiency of highway travel, have been proposed for operation in the 5850 to 5925 MHz band. The successful operation of these communication systems depends upon their compa...
The National Table of Frequency Allocations allocate the 2025–2110 MHz band to Federal space science services and the entire 1990–2110 MHz band to the non-Federal government fixed and mobile communication services. The Federal space science services ...
Minimum acceptable speech intelligibility of land mobile radios is influenced by a number of factors. These factors include the method of modulation, transmission bandwidth, channel spacing, received signal strength, and the ability of a radio receiv...
We present results of subjective viewer assessment of video quality of MPEG-2 compressed video containing wide-band Gaussian noise. The video test sequences consisted of seven test clips (both classical and new materials) to which noise with a peak-s...
Satellite radio system performance in the 136 to 138-MHz VHF meteorological satellite band is compromised by man-made noise external to the receiver. Methods used for predicting man-made noise power in this band are based on measurements conducted in...
Technology field trials for six personal communications services (PCS) common air-interface technologies (whose standards were developed by the Joint Technical Committee on Wireless Access) were performed at the US West Boulder Industry Test Bed (BIT...
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 uses the ITS radio spectrum measurement system and portabl...
Statistical noise models that simulate man-made noise are essential for the design of radio systems. Recently, the Institute for Telecommunication Sciences measured man-made VHF radio noise in the 136 to 138 MHz meteorological satellite band. These m...
Many government telecommunications needs, especially those that support National Security and Emergency Preparedness (NS/EP) missions, are becoming increasingly dependent on commercially available equipment and services. This is consistent with the g...
Federal telecommunications standards have traditionally been distributed in hard copy, i.e., in book form, with mandated 5-year revisions requiring a new book or new change pages for every updated edition. Distributing Federal telecommunications stan...
Multipath channels in indoor wireless communication systems exhibit a characteristic power delay profile, which can be a detriment to system performance. In this paper, we present a simplified model for calculating the decay rate of the power delay p...
Frequency-domain companding can be used in conjunction with audio coders that produce white coding noise. In [1-2] it is demonstrated empirically that this technique colors white coding noise so that it is better masked by audio signals, resulting in...
Complex impulse response measurements of a warehouse building were made at 5.8 GHz with a sliding correlator channel probe. These measurements were made with vertically and horizontally polarized directional antennas so performance improvement due to...