Pulse or digital communications – Repeaters – Testing
Patent
1996-12-18
1999-01-05
Chin, Stephen
Pulse or digital communications
Repeaters
Testing
375336, 375343, H04B 1707
Patent
active
058569987
ABSTRACT:
A technique for modulating and demodulating continuous phase modulation (CPM) spread spectrum signals and variations thereof. A transmitter encodes M data bits using a selected spread spectrum code, divides the spread spectrum code into a plurality of chip codes (such as even chips and odd chips), independently modulates the even and odd chips with orthogonal carrier signals using CPM or a related technique, and superposes the plurality of resultants for transmission. A receiver receives the superposed spread spectrum signal, divides the spread spectrum signal into duplicate signals, separately demodulates the duplicate signals into an odd chip signal and an even chip signal, simultaneously attempts to correlate the odd chip signal with a locally generated odd chip sequence and the even chip signal with a locally generated even chip sequence, and interleaves the correlation signals into a unified correlation signal. The unified correlation signal may be compared against other correlation signals to determine the content of the transmitted data.
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Burbach Mark
Durrant Randolph L.
Chin Stephen
Gluck Jeffrey W.
Omnipoint Corporation
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