Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2005-03-01
2005-03-01
Phu, Phuong (Department: 2631)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S146000, C375S147000, C375S303000, C375S334000, C375S272000
Reexamination Certificate
active
06862313
ABSTRACT:
A wireless transceiver comprises a digital to analog converter having an input for receiving a digital representation of a direct sequence spread spectrum signal and having an analog output. A filter has an input coupled to the analog output of the digital to analog converter. An adder has a first input coupled to the filtered output and a second input coupled to a loop control voltage generated by a phase lock loop. A VCO integrated into the phase lock loop has a control input coupled to the summed output. An RF output of the VCO produces a continuous phase frequency shift keyed spread spectrum signal in response to the digital representation of the direct sequence spread spectrums signal. A receiver converts received RF signal to baseband in-phase and quadrature that are in turn converted to digitized signals. A demodulator produces chip data that is despread using a matched filter.
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John Proakis, “Digital Communications”, Copyright 1995, 1989, 1983 by McGraw-Hill, Inc., pp. 806-808.
Beamish Norman J.
Laub D. Vincent
Walley John S.
Phu Phuong
Skyworks Solutions Inc.
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