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The topic of the 2022 International Symposium on Advanced Radio Technologies™ (ISART 2022), which took place fully virtually June 13, 14, 15, and 16, 2022, was “Evolving Spectrum-Sharing Regulation through Data-, Science-, and Technology-Driven Anal...

Learn how to identify impaired speech and avoid its causes. Listen to audio clips that demonstrate six useful tips for online conference and meeting organizers, as well as contributors who plan to speak during a live online event or submit a pre-rec...

Recently, prerecorded audio and video presentations, as well as virtual meetings, have become a common component of professional life, due to health and environmental considerations. This places new responsibility on participants to generate audio t...

The short-time Fourier transform (STFT) represents a window of audio samples as a set of complex coefficients. These are advantageously viewed as magnitudes and phases and the overall distribution of phases is very often assumed to be uniform. We sh...

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...

Reference signals in both LTE and 5G cellular networks present an untapped and abundant signal of oppor-tunity for high quality radio frequency (RF) propagation measurements. Commercial-off-the-shelf mobile phones continuously capture and report Ref...

Propagation modeling for over land paths has historically been performed using semi-empirical models. These models capture median propagation expected over a month or season but cannot model expected propagation for smaller time scales. Variability ...

In this manuscript, we assess the suitability of the ITU Recommendation P.2109 building entry loss models through continuous-wave and broadband measurements conducted in two distinct buildings: a historical structure and a recently constructed moder...

This paper surveys the current marketplace offerings for low-cost software-defined radio (SDR) technology and proposes a framework for cost-optimizing distributed sensing networks using a scenario in the Citizens Broadband Radio Service band. To det...

This article provides initial results of measurements made to assess the influence that different antenna patterns have on the received signal level of a mid-band troposcatter radio link. Measurements were performed at 3.475 GHz over a 185 km tropos...

Development of improved clutter modeling is critical to co-existence of incumbent and entrant systems. Most clutter modeling approaches center on a median clutter loss term and a statistical distribution representing location variability. In this pa...

This paper presents new recommendations for the discrete sampling of a mobile radio with non-line-of-sight Rayleigh fading and a Jakes power spectrum. The results are derived from a new analytical result for the variance of the local-mean voltage us...

Speech quality and speech intelligibility can vary dramatically across the wide range of currently available telecommunications systems, devices, and operating environments. This creates a strong demand for efficient real-time measurements of quality...

Ongoing NTIA/ITS research shows that it can be possible for 5G base stations to safely co-exist with safety-of-life radar altimeters. This video is a follow up to SP-22-560, “5G In-Air Field-Strength CoLT Measurements for Radar Altimeter Research.” ...

This memorandum provides technical details for the image quality experiment COCRID: A Challenging Optical Character Recognition Dataset. The design goals of the COCRID dataset are (1) to train no-reference metrics that track the quality of recognized...

This paper describes U.S. spectrum management measurement challenges and a potential scalable solution using satellite-based observations. Specifically, we investigate the radio frequency passive imaging technique of synthetic aperture source locali...

Today’s mobile wireless networks comprise many proprietary solutions with custom, closed-source software and hardware. Changes to these proprietary elements require complex and meticulous verification of the entire network. This dynamic increases cos...

This report presents an analysis of aggregate Citizens Broadband Radio Service (CBRS) Spectrum Access System (SAS) data reported quarterly from April 1, 2021, to January 1, 2023. The data provide valuable insights into the growth of CBRS, the impact ...

This study examines the effects of resolution bandwidth (RBW) when using the measurement methods described in National Telecommunications and Information Administration (NTIA) Technical Report 05-420 to measure the emission spectra of compound radar ...

This GitHub repository holds the data associated with NTIA TM-23-566. The data directories follow a format similar to the report with individual directories for the P0N, Q3N, and compound test cases. Each of these directories contains the measured sp...