August 1969 | Other ERL131-ITS 92

Required Signal-to-Noise Ratios for HF Communication Systems

Hiroshi Akima; Gene G. Ax; Wesley M. Beery

Abstract: Values of required signal-to-noise ratios are estimated for the following HF communication systems: amplitude-modulation (AM) voice communications systems, noncoherent frequency-shift-keying (NCFSK) radioteletypewriter systems, composite voice and teletypewriter systems, aural-reception radiotelegraphy, and phototelegraphy (facsimile). Except for NCFSK systems, for which certain aspects of the basic performance had to be evaluated in the course of this study, values of required signal-to-noise ratios are estimated from published data in the open literature.

Keywords: fading; frequency shift keying (FSK); amplitude modulation; diversity reception; HF comnunication system; radiotele-typewriter; required signal-to-noise ratio; voice communication; signal theory

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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