H - Electricity – 03 – D
Patent
H - Electricity
03
D
329/11, 325/35
H03D 3/18 (2006.01) H04B 7/216 (2006.01)
Patent
CA 1066779
Abstract of the Disclosure The present invention is directed to a demodulator for demodulating a wideband spread spectrum four-phase PSK (phase shift keyed) modulated carrier signal wherein the phase modulation was in response to an encoded data signal and wherein the encoding of the data signal and spreading of the spectrum was accomplished by the mixing of the data sig- nal with a pseudo-random pulse sequence (PN-sequence). The demodulator is comprised in part of a generator means for providing a pseudo-random pulse sequence correspond- ing to the sequence used to encode the data signal; and an encoding means for converting the provided PN-sequence into a four-phase PN sequence. A correlation means correlates the generated four-phase PN sequence against the received four-phase PSK modulated carrier signal to provide a two- phase collapsed spectrum signal. A switching means inter- posed between correlation means and the generator means switches two of the four phases of the four phase PN-se- quence signal applied to the correlation means until proper phasing is achieved.
259160
Gordy Robert S.
Sanders David E.
LandOfFree
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