Pulse or digital communications – Receivers – Interference or noise reduction
Reexamination Certificate
2001-01-19
2009-08-25
Fan, Chieh M. (Department: 2611)
Pulse or digital communications
Receivers
Interference or noise reduction
C375S267000, C375S299000
Reexamination Certificate
active
07580488
ABSTRACT:
A modulator/demodulator apparatus and method for applications, such as communications, active sensing and navigation is disclosed. The modulator time-delays and time-scales (compresses or dilates) an arbitrary, noise-like “base signal,” then it sums this time-scaled and time-delayed version of the base signal with the original base signal to create a “signal pair” or doublet. The two signals in the doublet are completely overlapped in time and frequency. This doublet creation process can be repeated (with different base signals and/or different time-scale/time-delay parameters) and multiple doublets can be summed together and simultaneously transmitted. This demodulator uses the applied differential time-scale and differential time-delay to extract information, such as a message or a radar image, from the doublet.
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Aghdam Freshteh N
Fan Chieh M.
Nixon & Peabody LLP
The Penn State Research Foundation
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