Search Results
The search returned 1,237 publication(s) on its.ntia.gov.
Measured antenna patterns of an end-fed slotted waveguide antenna and a phased-array patch antenna used in maritime radionavigation radars across the frequency range 8500–10800 MHz are presented along with a measurement technique that characterizes ...
This handbook provides a user’s manual for the batch video quality metric (BVQM) tool. BVQM runs under the Windows XP® operating system. BVQM performs objective automated quality assessments of processed video clip batches (i.e., as output by a vide...
The National Telecommunications and Information Administration (NTIA) launched this two-phase study of interference protection criteria (IPC) in order to compile, explain and validate, modify or supplement the levels of protection from interference ...
This report describes four Reduced Reference (RR) video calibration algorithms of low computational complexity. RR methods are useful for performing end-to-end in-service video quality measurements since these methods utilize a low bandwidth network...
This report demonstrates that digital television (DTV) susceptibility to gated-noise interference cannot be predicted by interference power characteristics alone. It was found that DTV susceptibility is also dependent on temporal characteristics of ...
This technical memorandum describes the results of radiated measurements of the emission spectrum of a maritime radar at varying azimuths relative to the base of the radar transmitter antenna rotary joint. The measurements were performed to address ...
This technical memorandum describes measurements of the radiated emission spectra of selected maritime radiolocation radar transmitters in multiple bandwidths. The results support published criteria for selection of measurement bandwidths for emissi...
The effects of mutual coupling on the radiation pattern of a four-element linear array were investigated. The objective was to improve the angular resolution of the array for direction-of-arrival estimation by compensating for mutual coupling. It is...
The Video Quality Metric (VQM) software was developed by ITS between 2002 and 2010. The VQM algorithms estimate how people perceive video quality. These VQM algorithms compare the processed video (output) with the original video (input). These model...
We present a general formulation of a basic open question regarding the perception of time-varying speech quality. We then describe the design, implementation, conduct, and analysis of a practical experiment that addresses a small but fundamental par...
The United States’ radiocommunication interests are global. Communications are the backbone of our economic and national security and radiocommunications are a critical component of the United States’ overall communications interests. Radio signals ...
It has been proposed that first–order Markov channel models can be used to adequately predict the behavior of a mobile "Rayleigh" fading channel and hence improve the reliability of bidirectional mobile communications systems. Previous authors have ...
The purpose of this handbook is to provide a user’s manual for the in-service video quality metric (IVQM) tool. IVQM performs automated processing of live video signals. This program runs under the Windows XP® operating system on two PCs communicati...
We describe new 2-channel multiple-description speech coders based on the ITU-T Recommendation G.711 PCM speech coder. The new coders operate in the PCM code domain in order to exploit the companding gain of PCM. They apply pairs of complementary asy...
This is the third issue of the Proceedings of the International Symposium on Advanced Radio Technologies (ISART), and the value of these proceedings is starting to become evident. The purpose of ISART is to explore the future use of existing and eme...
The wide application of radar for various functions makes large demands on the electromagnetic spectrum, and requires the application of effective frequency management for the equipment and systems involved. Requirements for certain equipment charac...
We describe a 2-channel multiple-description speech coder based on the ITU-T Recommendation G.711 PCM speech coder. The new coder operates in the PCM code domain in order to exploit the companding gain of PCM. It applies a pair of 2-dimensional struc...
In this study, we hypothesize that ultrawideband (UWB) interference potential can be quantified in terms of UWB signal characteristics. To test this hypothesis, a test system was designed and built to inject UWB signals with known characteristics in...
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...
This paper presents a new reduced reference (RR) video quality monitoring system that utilizes less than 10 kbits/s of reference information from the source video stream. This new video quality monitoring system utilizes feature extraction techniques...