NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Digital 8-DPSK Modem For Trellis-Coded CommunicationDigital real-time modem processes octuple differential-phase-shift-keyed trellis-coded modulation. Intended for use in communicating data at rate up to 4.8 kb/s in land-mobile satellite channel (Rician fading) of 5-kHz bandwidth at carrier frequency of 1 to 2 GHz. Modulator and demodulator contain digital signal processors performing modem functions. Design flexible in that functions altered via software. Modem successfully tested and evaluated in both laboratory and field experiments, including recent full-scale satellite experiment. In all cases, modem performed within 1 dB of theory. Other communication systems benefitting from this type of modem include land mobile (without satellites), paging, digitized voice, and frequency-modulation subcarrier data broadcasting.
Document ID
19890000439
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Jedrey, T. C.
(Caltech)
Lay, N. E.
(Caltech)
Rafferty, W.
(Caltech)
Date Acquired
August 14, 2013
Publication Date
September 1, 1989
Publication Information
Publication: NASA Tech Briefs
Volume: 13
Issue: 9
ISSN: 0145-319X
Subject Category
Electronic Systems
Report/Patent Number
NPO-17578
Report Number: NPO-17578
ISSN: 0145-319X
Accession Number
89B10439
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Available Downloads

There are no available downloads for this record.
No Preview Available