Pulse or digital communications – Transmitters – Amplitude modulation
Patent
1997-11-03
1999-07-27
Chin, Stephen
Pulse or digital communications
Transmitters
Amplitude modulation
375277, 341 72, 341 53, 360 44, H03C 152, H04L 2704, H03M 508
Patent
active
059303034
ABSTRACT:
A method for transmitting "biphase" encoded digital signals including the steps of setting an aperture corresponding to a data bit; dividing said aperture into a plurality of segments; setting a first segment, selected from said plurality of segments of said aperture, dependent upon whether the bit is a digital one or zero; setting a second segment, selected from said plurality of segments of said aperture, so as to fit the remaining aperture of the data bit; and, transmitting said first and second segments of said data bit; wherein a narrow spectrum results containing no low frequency components and separated from 0 Hz by an amount equal to the data rate or 1/2 the data rate.
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"VPSK and VMSK Modulation Transmit Digital Audio and Video at 15Bits/Sec/Hz"; by H.R. Walker.
"Universal Formula Analyzes all Modulation Methods"; by H.R. Walker, Applied Microwave & Wireless, Jul./Aug. 1997, pp. 82, 84-91.
"Improved Data Transmissions Using Single-Sideband FM with Suppressed Carrier", by Bohdan Stryzak and H.R. Walker Microwaves & RF, Nov. 1994, pp. 23-29.
Chin Stephen
Deppe Betsy L.
Plevy Arthur L.
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