Search Results
The search returned 1,237 publication(s) on its.ntia.gov.
This report is an update of a previous report of the same title published by the former Office of Telecommunications Policy. It provides guidance to Federal system planners in securing spectrum support for proposed new or modified telecommunications ...
Since the normally assumed with Gaussian interference is the most destructive in terms of minimizing channel capacity, substantial improvement can usually be obtained if the real-word interference environment (non-Gaussian) is properly taken into acc...
The evaluation of prediction models for microwave attenuation by rainfall Jan. 1984
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...
The neutral atmosphere is characterized for the frequency range from 1 to 300 GHz as a nonturbulent propagation medium. Attenuation and propagation delay effects are predicted from meteorological data sets: pressure, temperature, humidity, suspended...
Analytical and empirical results concerning the relative spectrum efficiency of twogenerjc (wideband and narrowband) land mobile radio systems are presented. Graph theoretic frequency assignment techniques are used to relate spectrum usage to transmi...
American National Standard X3.102 defines a set of 21 standard parameters that provide a uniform means of specifying the performance of data communication systems and services as seen by users. This report is basically an explanation and elaboration ...
This report contains a consolidation of practical engineering equations for linear communication antennas suitable for use in the prediction and analysis of the system performance of high frequency communication equipment. The theoretical background ...
An assessment of the line-of-sight (LOS) power flux-density (pfd) limits for satellites operating in the 2025–2300 MHz frequency range was conducted. Two computer models, one developed by the Bell Telephone Laboratories (BTL) and the other by the Sy...
This report is concerned with the spectral representation of analog frequency modulated (FM) signals, with particular attention to frequency division multiplexing (FDM)/FM satellite communication systems. The FM spectral modeling and gaussian approxi...
The problem of counting the occurrences of bit errors, block errors, bit additions or deletions and block additions or deletions is considered. A general method is developed for counting such occurrences for cases when the occurrences are not excessi...
The report is a primer on Integrated Services Digital Networks (ISDN's). The ISDN concept is believed by many to be the communication means for the future information age. A number of national ISDN's interconnected together can provide a high-perform...
This report provides a description of the computational details in the IF-77 (ITS-FAA-1977) radio wave propagation model. The IF-77 model is useful in estimating service coverage for radio systems operating in the 0.1 to 20 GHz frequency range. It i...
A diagnostic probe used to fully describe the propagation characteristics of a millimeter wave channel by nearly simultaneous recording of an impulse response, frequency spectra, amplitude response, and bit error rate is discussed. A 30.3 GHz carrier...
It is demonstrated that most of the classical raindrop-size distribution formulations give inconsistent results when used to calculate specific attenuations at millimeter-wave frequencies. For this reason, it was decided it might be desirable to sub...
Although the use of transmissions that are composed of bursts of information is not new, its application in a terrestrial environment at VHF and UHF is. The usual way of expressing the variabilities in received signal level due to propagation effects...
A radio propagation prediction computer code has been developed to permit rapid simulation of HF air-to-ground telecommunication circuits. This prediction program provides estimates of both skywave and groundwave HF propagation parameters. The skywav...
A simple model of the attenuation of millimeter waves by precipitating liquid water clouds is presented. As frequency increases from the microwave band into the millimeter wave band, the model indicates a significant increase in the relative importan...
This report describes the operation and use of the Ionospheric Communications Analysis and Prediction Program (IONCAP). The computer program is an integrated system of subroutines designed to predict high-frequency (HF) skywave system performance an...