David Anderson and David J. Cohen

Abstract:

The Digital Emission Spectrum Model report was released in September 1993. A computer program was developed to calculate the power spectral density (PSD) and the fractional power containment bandwidth for various digital modulation techniques. The power containment capability was used to provide guidance for determination of necessary bandwidth in support of Annex J of the NTIA Manual. This report documents the models contained in the computer program and illustrates the models with various sample problems. The report also shows the verification of the computer program implementation.

The digital modulation techniques that are presently included in the computer program are:

Phase shift keying (PSK) with non–return-to-zero modulation

Quadrature amplitude modulation (QAM)

Frequency shift keying (FSK)

Minimum shift keying (MSK)

Bi-phase shift keying with raised cosine modulation

Bi-phase shift keying with Manchester modulation

Keywords: spectrum; emission spectrum; digital modulation; bandwidth; necessary bandwidth; power spectral density; transmitter spectrum

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.

For questions or information on this or any other NTIA scientific publication, contact the ITS Publications Office at ITSinfo@ntia.gov or 303-497-3572.

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