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Spectrum Engineering Reports

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
e-mail edrocella@ntia.gov

Spectrum Resource Assessment in the 2.7 to 2.9 GHz Band Phase II: Measurements and Model Validation (Report No. 1)

Report ID
OT Report 76-97
August 01, 1976
Robert L. Hinkle, Robert M. Pratt, and Robert J. Matheson
Abstract

The Office of Telecommunications (OT) undertook a detailed program to measure and analyze spectrum utilization in the 2.7. to 2.9 GHz band in the Los Angeles and San Francisco areas in support of an Office of Telecommunications Policy (OTP) Spectrum Resource Assessment task. The measurement program consisted of on-site visits to compare predicted and actual PPI interference patterns, and utilization of the Radio Spectrum Measurement System (RSMS) van to validate the component models used in predicting radar-to-radar interference.

From the measured data and a supporting literature search, it was concluded that ducting and man-made clutter (building attenuation) should be included in the propagation loss predictions in order to improve the prediction accuracy of radar-to-radar interference and radar frequency assignments. Even though potential multipath wave interference conditions can be identified, to account for this analytically would require and extremely complex antenna and terrain model. Due to modeling inaccuracies, the difference between the predicted and actual radar-to-radar Interference-to-noise Ratio (INR) levels may be as large as 22 dB (2σ standard deviation region). However, INR errors of approximately 25 dB can still result in relatively acurate predictions of interference patterns on the victim PPI display for conditions where mainbeam-to-backlobe antenna coupling predominates. In summary, it was concluded that the analytical radar-to-radar interference techniques used in this investigation can be used to predict interference patterns on the victim radar PPI display with sufficient accuracy to allow assessment of radar band congestion, frequency assignment flexibility, and potential of the band to absorb new users.

Measurements of Wind Profiler EMC Characteristics

Report ID
93-301
March 01, 1994
Daniel Law, Frank Sanders, Gary Patrick, and Michael Richmond
Abstract

 

This report provides the results of measurements that were conducted on a 404.37 MHz wind profiler located in Platteville, Colorado. These measurements included: radiated spectra (both high and low mode), radiated harmonic and subharmonic power measurements, characterization of the antenna frequency response, determination of the radiated antenna gain values near ground level, susceptibility of profiler performance to interference from selected emission waveforms, and the effects on a typical land mobile/amateur operation from wind profiler emissions. In addition, the report presents a detailed wind profiler system description including operations/functions, system hardware, digital signal processing, as well as an
analytical estimation of the interference effects on profiler performance. The information contained within this report can serve as an aid in conducting electromagnetic compatibility (EMC) analysis to determine compatibility between wind profilers and other systems.

Evaluation of Discrete Address Beacon System (DABS) EMC

Report ID
80-53
November 03, 1980
Robert Pratt and Jay Levy

The FAA is currently developing the Discrete Address Beacon System (DABS) as an evolutionary upgrading of the Air Traffic Control Radar Beacon System (ATCRBS). Questions have been raised regarding the Electromagnetic Compatibility (EMC) of ATCRBS and DABS because of their common channel usage. The committee on Science and Technology, U.S. House of Representatives, requested that the National Telecommunications and Information Administration (NTIA) review DABS as a radio telecommunication system giving particular attention to potential interference problems.

A Guide to the Use of the ITS Irregular Terrain Model in the Area Prediction Mode

Report ID
NTIA REPORT 82-100
April 01, 1982
George A Hufford, Anita G. Longley, and William A. Kissick
Abstract

 

The ITS model of radio propagation for frequencies between 20 MHz and 20 GHz (the Longley-Rice model) is a general purpose model that can be applied to a large variety of engineering problems. The model, which is based on electromagnetic theory and on statistical analyses of both terrain features and radio measurements, predicts the median attenuation of a radio signal as a function of distance and the vari-ability of the signal in time and in space.
The model is described in the form used to make "area predictions" for such applications as preliminary estimates for system design, military tactical situations and surveillance, and land-mobile sys-tems. This guide describes the basis of the model, its implementation, and some advantages and limitations of its use. Sample problems are included to demonstrate applications of the model.
 

Third Interim Progress Report on the Ten-Year Plan and Timetable

November 29, 2012

NTIA submits this Progress Report pursuant to the Presidential Memorandum issued on June 28, 2010, which directed the Department of Commerce, working through NTIA and in collaboration with the Federal Communications Commission (FCC), to identify and make available 500 megahertz of spectrum over the next ten years for expanded wireless broadband use.

Analysis and Resolution of RF Interference to Radars Operating in the Band 2700-2900 MHz from Broadband Communication Transmitters

Report ID
NTIA Technical Report TR-13-490
October 31, 2012
Frank H. Sanders, Robert L. Sole, John E. Carroll, Glenn S. Secrest, T. Lynn Allmon

Abstract: This report describes the methodology and results of an investigation into the source, mechanism, and solutions for radiofrequency (RF) interference to WSR-88D Next-Generation Weather Radars (NEXRADs). It shows that the interference source is nearby base stations transmitters in the Broadband Radio Service (BRS) and the Educational Broadband Service (EBS) and that their out-of-band (OOB) emissions can cause interference on NEXRAD receiver frequencies.

Antenna Models For Electromagnetic Compatibility Analyses

Report ID
NTIA TM-13-489
October 26, 2012
C.W. Wang, T. Keech
Abstract

This technical memorandum contains recommendations for antenna models that can be used in performing electromagnetic compatibility (EMC) analysis related to spectrum management. The technical memorandum contains two compilations of antenna parameters. The first one is the collection of rules, regulations, and recommendations regarding antennas that are published by regulators, as well as improving, EMC. NTIA conducted an extensive review and analysis of the existing rules, regulations, and recommendations and compiled the findings in this technical memorandum. The second compilation is the recommendations of antenna parameters for spectrum managers to use in conducting EMC analysis associated with: system review for equipment approval, frequency assignment, and spectrum sharing studies. NTIA evaluated the characteristics of the radio services, the federal usage of the radio spectrum, and the technical merit and practicality of the antenna parameters in the rules, regulations, and recommendations, and then developed recommendations of antenna parameters for conducting these EMC analysis tasks of all of the radio services.
 

An Assessment of the Viability of Accommodating Wireless Broadband in the 1755-1850 MHz Band

March 27, 2012
Abstract

NTIA released this report on March 27, 2012 finding that 95 megahertz (MHz) of prime spectrum, the 1755-1850 MHz band, can be repurposed for wireless broadband use.  While NTIA’s analysis of the federal agencies’ reports shows it is possible, there are several challenges that need to be met before making a formal recommendation to the Federal Communications Commission (FCC).  Accordingly, in this report, NTIA proposes a new path forward for spectrum repurposing that relies on a combination of relocating federal users and sharing spectrum between federal agencies and commercial users.  NTIA notes that spectrum sharing will be a vital component to satisfying the growing demand for spectrum, and federal and non-federal users will need to adopt innovative spectrum-sharing techniques to accommodate this demand.  Reallocation of this spectrum would represent significant progress towards achieving President Obama’s goal to nearly double the amount of commercial spectrum available this decade.  The President’s initiative will spur investment, economic growth, and job creation while supporting the growing demand by consumers and businesses for wireless broadband services.

Department of Commerce Report:  An Assessment of the Viability  of Accommodating Wireless Broadband in the 1755-1850 MHz Band (pdf)


Federal Agency Input on 1755-1850 MHz: