Sorry, you need to enable JavaScript to visit this website.
Skip to main content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.

Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.


The site is secure.

The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Spectrum Engineering

NOTE: These reports are available either on-line in PDF (portable document) format or only as hard-copy. If you would like a copy of a report that is not available electronically, please make note of the document number and submit your request to:

NTIA Office of Spectrum Management
System Engineering and Analysis Division
Tel. (202) 482-2608
Fax (202) 482-4595

Related content

Technical Feasibility of Sharing Federal Spectrum with Future Commercial Operations in the 3450-3550 MHz Band

Report ID
Technical Report 20-546
January 27, 2020
Edward Drocella, Robert Sole, Nickolas LaSorte

As part of NTIA’s ongoing effort to identify candidate bands for repurposing to accommodate commercial wireless services, NTIA selected the 3450-3550 MHz band to study for potential sharing between federal systems and a variety of non-federal commercial wireless operations.  NTIA worked with the Department of Defense, which operates the federal systems in the band, to determine if commercial services could operate without causing impact to incumbent operations.  The report indicates that commercial operations would impact incumbent federal systems; however, spectrum sharing may be possible that provides both sufficient protection to incumbent operations and attractive opportunities for commercial business – subject to further analysis and deployment of innovative time-based sharing mechanisms.

Keywords: radar; interference; spectrum sharing; 3450-3550 MHz; airborne radar


    3.5 GHz Exclusion Zone Analyses and Methodology

    Report ID
    Technical Report TR-15-517
    June 18, 2015
    Edward F. Drocella Jr.; James C. Richards; Robert L. Sole; Fred Najmy; April Lundy; Paul M. McKenna

    This report describes the 3.5 GHz Study. It explains the assumptions, methods, analyses, and system characteristics used to generate the revised exclusion zones for small-cell commercial broadband systems to protect federal radar operations (ship and land based) from aggregate interference in the band 3550–3650 MHz. The 3.5 GHz Study’s exclusion zones are compared with the exclusion zones that were generated in the Fast Track Report, which considered macro-cell operations.

    Keywords: RADAR; spectrum sharing; FCC; NTIA; 3.5 GHz band; exclusion zones; CBRS; 3550-3650 MHz

    Subscribe to Spectrum Engineering RSS feed