A progress report on communications digital signal processing : theory and performance of frequency domain differentially encoded multi-frequency modulation
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Authors
Moose, Paul H.
Advisors
Second Readers
Subjects
Date of Issue
1990-09
Date
October 1989 to July 1990
Publisher
Monterey, California. Naval Postgraduate School
Language
Abstract
Multi-frequency modulation is a highly bandwidth efficient signalling technique for
digital communications. In order to make the technique as insensitive as possible to
unknown or fluctuating phase and amplitude changes in the channel transfer function
between the transmitter and receiver, frequency domain differential encoding techniques
have been developed and their error performance calculated. It is shown that in the
range of 2 to 8 bits/Hz of channel bandwidth efficiencies, differential encoding
results in a penalty of 3 to 5 db in required Eb /N when compared to fully coherent
multi-frequency modulation. Design procedures are presented that provide near optimum
QAM constellations for fully differential coding and for the hybrid scheme of
differential phase coding and absolute coding of amplitudes.
Type
Technical Report
Description
Series/Report No
Department
Organization
Identifiers
NPS Report Number
NPS-62-90-012
Sponsors
This report was prepared in conjunction with research
conducted for the Naval Oceans System Command and funded by
the Naval Postgraduate School.
Funding
O&MN Direct Funding
Format
53 p. : ill. ; 28 cm.
Citation
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.