Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2008-01-29
2008-01-29
Payne, David C. (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C342S357490, C342S368000, C370S339000, C375S133000, C375S135000, C375S136000, C375S140000
Reexamination Certificate
active
07324582
ABSTRACT:
A system (100) and method for the reception and despreading of a code-division multiple access (CDMA) global positioning system (GPS) signal (200), or other direct-sequence spread-spectrum (DSSS) signals, is provided. An antenna array (102) receives the DSSS signal (200) over a plurality of elements (116). A preprocessor (104) down converts and digitizes the DSSS signal (200) to produce a signal stream (202) in the time domain. An FFT (106) transforms the signal stream (202) to the frequency domain. A beam former (108) generates a reception beam (201) for the DSSS signal (200) in the frequency domain, and also implements a narrowband frequency notch, if desired. A despreader (110) despreads the transformed signal stream (204) in the frequency domain. An IFFT (112) transforms the despread signal stream (208) back to the time domain. And a postprocessor (114) converts the transformed despread signal stream (210) into a desired received signal stream (212) in the time domain.
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Dsouza Adolf
General Dynamics C4 Systems, Inc.
Payne David C.
Steptoe & Johnson
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