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This paper proposes a mid-band statistical propagation model in which objective clutter metrics derived from lidar data provide the means to predict the distribution of clutter loss. Model performance is compared with 3.5 GHz propagation measurements...

This article provides a comprehensive overview of no reference (NR) metrics for image quality analysis (IQA) and video quality analysis (VQA). We examine 26 independent evaluations of NR metrics (previously published) and analyze 32 NR metrics on si...

This paper calculates confidence intervals for 89 datasets that use the 5-level Absolute Category Rating (ACR) method to evaluate the quality of speech, video, images, and video with audio. This data allows us to compute the subjective test confidence ...

The Gilbert-Elliot model is a popular and effective tool for treating bursty (nonindependent) errors in communication links. This memorandum provides linkages between model parameters and error statistics. The motivation is that these linkages can al...

The Gilbert-Elliot burst error model is a popular and effective tool for treating bursty (non-independent) errors in communication links. This software accompanies the following publication: Pieper J; Voran S, “Relationships between Gilbert-Elliot B...

This GitHub repository contains two datasets collected at the Commerce Department’s Radio Quiet Zone at Table Mountain, Colorado, as well as Hill Air Force Base, Utah:Calibrated airborne field-strength measurements of spatial radiation patterns in t...

Introduction of Fifth Generation New Radio (5G NR) systems in the US between 3700 and 3980 MHz has raised concerns about electromagnetic compatibility with airborne radar altimeter (radalt) receivers operating between 4200 and 4400 MHz. This report ...

This memorandum provides technical details of the VCRDCI dataset. This dataset was designed similarly to a video quality subjective experiment, but the VMAF metric was used to create simulated subjective data. The VCRDCI dataset contains 130 scenes t...

This technical memorandum provides details for the image quality subjective experiment ITSnoise. This experiment includes 24 scenes, each digitally photographed using 12 different Image Capture Methods (ICMs) for a total of 288 images. The ICMs were ...

Line-of-sight (LOS) and non-line-of-sight (NLOS), continuous-wave (CW), mobile outdoor propagation measurements were performed in the 37–40 GHz band in a small city downtown environment (Boulder, Colorado). The measurement system was optimized to pr...

This paper examines the estimation of the local mean voltage of a radio signal in a Rayleigh fast-fading environment. We focus on the statistical uncertainties of local voltage averages obtained by both integrating the voltage envelope of a specifie...

This article is intended to motivate and describe a new tropospheric scatter modelling and measurement validation effort that is underway at the Institute for Telecommunication Sciences (ITS). Immediately after World War II, there was a flurry of res...

This paper describes a new National Telecommunications and Information Administration (NTIA) effort focused on the development of methods to determine appropriate interference protection criteria (IPC) as a means to resolve contention around spectrum...

In June 2018, ITS performed mobile clutter measurements in Salt Lake City, UT at 1.7 GHz. This measurement campaign was designed for path geometries with larger take-off angles by placing the transmitter in the hills of the nearby mountains. The resu...

Cell towers broadcast reference signals that mobile phones measure and report as reference signal received power (RSRP). Phones use the reference signal measurements for connectivity and handover between towers. This study explores the use of softwa...

This brief video provides an overview of ITS’s approach to taking RF measurements to provide data relevant to the topic of radio interference that might possibly occur from some U.S. 5G transmitters to band-adjacent airborne radar altimeter (radalt)...

Circa 1960, the National Bureau of Standards intensively studied over-the-horizon radio propagation due to tropospheric (aka forward) scatter. The results of that effort, published in the form of graphs and/or empirical mathematical functions based o...

We demonstrate that the optimal audio signal processing frame duration in oracle binary masking and oracle magnitude restoration is determined by joint minimization of two antagonistic artifacts: temporal blurring (which increases with frame duration...

This document provides an analysis of responses to the 5G Challenge Notice of Inquiry (NOI) issued by the National Telecommunications and Information Administration (NTIA) on behalf of the Department of Defense (DoD). This analysis was created by NTI...

Recent studies have shown that it is possible to characterize subject bias and variance in subjective assessment tests. Apparent differences among subjects can, for the most part, be explained by random factors. Building on that theory, we propose a ...