Pulse or digital communications – Pulse amplitude modulation
Reexamination Certificate
2008-06-12
2011-11-29
Liu, Shuwang (Department: 2611)
Pulse or digital communications
Pulse amplitude modulation
C327S050000, C327S178000, C329S311000, C332S115000, C370S533000
Reexamination Certificate
active
08068571
ABSTRACT:
Systems (400, 500, 600) and methods (300) for generating a chaotic amplitude modulated signal absent of cyclostationary features by preserving a constant variance. The methods involve: generating a PAM signal including pulse amplitude modulation having a periodically changing amplitude; generating a first part of a constant power envelope signal (FPCPES) by dividing the PAM signal by a square root of a magnitude of the PAM signal; generating a second part of the constant power envelope signal (SPCPES) having a magnitude equal to a square root of one minus the magnitude of the PAM signal; and generating first and second spreading sequences (FSS and SSS). The methods also involve combining the FPCPES with the FSS to generate a first product signal (FPS) and combining the SPCPES with the SSS to generate a second product signal (SPS). A constant power envelope signal is generated using the FPS and SPS.
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Chester David B.
Michaels Alan J.
Fox Rothschild LLP
Harris Corporation
Liu Shuwang
McKie Gina
Sacco Robert J.
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