Search Results
The search returned 1,237 publication(s) on its.ntia.gov.
This paper describes the design and retrofit of the 3.7 meter (12-foot) dish antenna located near building I10C at the U.S. Department of Commerce Table Mountain Field Site and Radio Quiet Zone.
Frame erasures and background noise are two factors that can interact with speech coding to reduce speech intelligibility and thus impair public safety mission-critical voice communications. We conducted two tests of intelligibility in the face of th...
Version three of Advanced Wireless Services (AWS 3) radio systems will soon use spectrum that is adjacent to bands currently used by airborne telemetry links at U.S. government test and training ranges (TTRs). Spectrum sharing analyses need to be pe...
A planned procedure is described for testing 3.5 GHz environmental sensing capability (ESC) devices for their responses to radar pulses in a laboratory environment. These test procedures will be used to gather data on ESC pulse-detection performance...
Future 3.5 GHz Citizens Broadband Radio Service Device (CBSD) transmitters in the U.S. will share spectrum with incumbent Federal radar systems. To avoid interfering with radar receivers in exclusion zones, CBSDs will be deployed in conjunction with...
Separating an acoustic signal into desired and undesired components is an important and well-established problem. It is commonly addressed by decomposing spectral magnitudes after exponentiation and the choice of exponent has been studied from numero...
This paper discusses a mobile propagation measurement in Los Angeles, CA and compares these measurements to the output from the Irregular Terrain Model (ITM). Propagation measurements are currently being used at the Institute for Telecommunication Sc...
We describe an advanced mobile channel sounder system that has been under development by engineers at NTIA’s Institute for Telecommunication Sciences since 2010. We provide a description of the channel sounder and the key system components. We then ...
A video is not always an accurate representation of what a first responder sees at an incident. New research suggests that first responders would benefit from a camera that removes airborne obscurants and shadows before the video is compressed. Curre...
The Institute for Telecommunication Sciences (ITS) is the research and engineering laboratory of the National Telecommunications and Information Administration (NTIA), an agency of the Department of Commerce (DoC). ITS serves as a principal federal r...
Future spectrum sharing between high-power radars and Citizens Broadband Radio Service Device CBSD in the 3550–3650 MHz (3.5 GHz) band could expose radio frequency (RF) receiver front-end low noise amplifiers (LNAs) to high peak power radar pulse sig...
This report identifies camera technology gaps that impact first responders. These technology gaps were identified by interviewing first responders about images, video, and camera systems in general. This is a working document that is intended to fost...
We present ABC-MRT16—a new algorithm for objective estimation of speech intelligibility following the Modified Rhyme Test (MRT) paradigm. ABC-MRT16 is simple, effective and robust. When compared to subjective MRT data from 367 diverse conditions that...
Crowdsourcing of subjective speech, audio, and video quality of experience (QoE) tests has received much interest and study, but crowdsourcing of speech intelligibility testing has not. We hypothesize that speech intelligibility tests offer a unique...
We describe the design, implementation, and analysis of a speech intelligibility test. The test included five codec modes, four frame-erasure rates, and two background noise environments, for a total of 40 conditions. The test protocol required twent...
The Institute for Telecommunication Sciences (ITS) is the research and engineering laboratory of the National Telecommunications and Information Administration (NTIA), an agency of the Department of Commerce (DoC). ITS serves as a principal federal r...
A spectrum sharing scheme is considered in which ship-based radar stations are operating in the same spectrum band as on-shore communication transmitters, and in which the communication transmitters will cause interference to the radar receivers when...
This paper presents a subjective image quality experiment design that specifically targets understanding consumer perception of visual quality. With this consumer-oriented goal in mind, images were captured from a large number of representative consu...
The new video coding standard, MPEG-H Part 2 High Efficiency Video Coding (HEVC) or H.265, was developed to be roughly twice as efficient as H.264/AVC—meaning H.265/HEVC could deliver the same quality as H.264/AVC using roughly half the bitrate. In t...
How accurately are people able to use the absolute category rating (ACR) 5-level scale? Put another way, how repeatable are an individual subject’s scores? Several subjective experiments have asked subjects to rate the same sequences a couple of time...