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MSAT voice modulation considerationsThe challenge for Mobile satellite (MSAT) voice services is to provide near toll quality voice to the user, while minimizing the power and bandwidth resources of the satellite. The options for MSAT voice can be put into one of two groups: Analog and Digital. Analog, nominally narrowband single sideband techniques, have a shown robustness to the fading and shadowing environment. Digital techniques, a combination of low rate vocoders and bandwidth efficient modems, show the promise of enhanced fidelity, as well as easier networking to the emerging digital world. The problems and tradeoffs to designers are many, especially in the digital case. Processor speed vs. cost and MET power requirements, channel coding, bandwidth efficiency vs. power efficiency etc. While the list looks daunting, in fact an acceptable solution is well within the technology. The objectives are reviewed that the MSAT voice service must meet, along with the options that are seen for the future.
Document ID
19920014929
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Bossler, Dan (Telesat Mobile Inc., Ottawa Ontario, Canada)
Date Acquired
September 6, 2013
Publication Date
January 1, 1990
Publication Information
Publication: JPL, California Inst. of Tech., Proceedings of the 2nd International Mobile Satellite Conference (IMSC 1990)
Subject Category
Communications And Radar
Accession Number
92N24172
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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