A hybrid-sideband communications system.
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Authors
Feit, Harry H.
Subjects
Advisors
Cooper, P.E.
Hoisington, D.B.
Date of Issue
1960
Date
Publisher
Monterey, California: U.S. Naval Postgraduate School
Language
en_US
Abstract
The purpose of this paper is to present a communications system
which uses a combination of single and double- sideband techniques.
Audio intelligence information is transmitted via single sideband and
a single frequency tone is transmitted via double sideband to provide
a means of carrier- frequency reinsertion at the receiving terminal.
This system provides the power and spectrum conservation achieved by
single-sideband techniques, and the means of obtaining the proper frequency for carrier reinsertion at the receiver which can be obtained
by synchronous reception of the double- sideband information.
The carrier frequency, which is common to both the single and doublesideband
signals during the generation process at the transmitter, is
suppressed to the fullest possible extent prior to the actual transmission
of the sidebands. Use of a narrow bandwidth filter for the
double sidebands at the receiver allows the synchronizing tone to be transmitted at a level much lower than that of the intelligence-bearing
single sideband, providing economy of transmitted power. The inherent
automatic-frequency-control feature of the synchronous detector allows
system frequency stability requirements to be lessened, and provides
rapid frequency correction to overcome Doppler frequency shifts.
Type
Thesis
Description
Series/Report No
Department
Electronics
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NPS Report Number
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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.