Pulse or digital communications – Receivers
Reexamination Certificate
2000-02-15
2008-09-23
Chin, Stephen (Department: 2634)
Pulse or digital communications
Receivers
C375S224000, C375S344000, C455S226100
Reexamination Certificate
active
07428270
ABSTRACT:
Disclosed is a unique system and method for recognizing the type of modulation embedded in an unknown complex baseband signal, comprising a receiver section for extracting the complex baseband signal from a modulated signal having a carrier frequency, and comprising an orderly series of signal processing functions for (a) estimating the bandwidth of the unknown signal, (b) removing the out-of-band noise and correcting gross carrier frequency errors, (c) discriminating between constant envelope and irregular envelope signals, (d) estimating and correcting residual carrier frequency errors, (e) classifying a constant envelope signal into one of the following modulation formats: {Continuous Wave (CW), Frequency Modulation (FM), Frequency Shift Keying (FSK)}, and (f) classifying an irregular envelope signal into one of the following modulation formats: {Amplitude Modulation (AM), Double Sideband Suppressed Carrier (DSB-SC), Binary Shift Keying (BPSK), Quaternary Phase Shift Keying (QPSK), π/4-shifted QPSK, M-ary PSK (MPSK), and OTHER classes}.
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Boudreau Daniel
Dubuc Christian
Chin Stephen
Lugo David B.
Varnum Riddering Schmidt Howlett LLP
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