Generating and Demodulating
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Authors
Moose, Paul H.
Subjects
Advisors
Date of Issue
1997-01
Date
Publisher
Monterey, California: Naval Postgraduate School
Language
en_US
Abstract
This paper discusses a technique for modulating and demodulating M-ary FSK using an FFT based
modem typical of Coded Orthogonal Frequency Division Modulation (COFDM) systems.
COFDM is one of the more promising spectrally efficient, high data rate modulation techniques for
line-of-sight communications between mobile platforms. This paper will show that legacy FSK
radios like the AN/MRC-142 (binary FSKmodulation at 144, 288, 576 kbps) used by the U.S.
Marine Corps could be easily implemented in a COFDM modem orginally designed for higher data
rates and better spectral efficiency than the legacy radio. In addition, the performance of such an
implementation is analyzed in detail and shown to result in negligible performance degradation
(0.05 dB or less). Digital processing speed requirements are analyzed and shown to be similar to
digital implementation of conventional FSK receivers. MATLAB code is included that simulates
the modem.
Type
Technical Report
Description
The views expressed in this report are those of the author and do not reflect the official policy or
position of the Department of Defense or the United States Government.
Series/Report No
Department
Electrical and Computer Engineering
Identifiers
NPS Report Number
NPS-EC-97-003
Sponsors
This report was sponsored by NCCOSC RDTE Division.
Funder
Format
Citation
Distribution Statement
Approved for public release; distribution is unlimited.