October 1983 | NTIA Technical Report TR-83-134

FM Spectral Modeling and FDM/FM Simulation Programs

Cesar A. Filippi

Abstract: This report is concerned with the spectral representation of analog frequency modulated (FM) signals, with particular attention to frequency division multiplexing (FDM)/FM satellite communication systems. The FM spectral modeling and gaussian approximation principles are analyzed and extended to develop computer simulation programs capable of providing representative FM spectra. A generalized program is developed to accommodate a variety of baseband and preemphasis characteristics, and adapted to generate FDM/FM telephony spectra. The program features the automatic validation and generation of the gaussian spectrum model if applicable, or the automatic simulation of the modulation process to generate the FM spectrum samples otherwise. The program is used to simulate a collection of satellite FDM/FM telephony spectra, which are to be applied as input data into other available interference analysis programs, as part of a major automated computer capability dedicated to the comprehensive assessment of orbital congestion and spectrum resource management concerns pertinent to national and international satellite communication systems scenarios.

Keywords: FM spectrum models; Gaussian Spectral Approximation; FM spectrum simulation; FDM/FM Telephony Spectra

To request a reprint of this report, contact:

Ed Drocella, Chief,
Spectrum Engineering and Analysis Division
Office of Spectrum Management
National Telecommunications and Information Administration
(202) 482-1652

Disclaimer: Certain commercial equipment, components, and software may be identified in this report to specify adequately the technical aspects of the reported results. In no case does such identification imply recommendation or endorsement by the National Telecommunications and Information Administration, nor does it imply that the equipment or software identified is necessarily the best available for the particular application or uses.

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