Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2007-05-22
2007-05-22
Burd, Kevin (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S326000, C342S357490
Reexamination Certificate
active
10376450
ABSTRACT:
A Spread Spectrum system acquires signals with frequency uncertainty. The present invention independently computes the number of frequency bands necessary to cover the carrier frequency uncertainty and the chip rate uncertainty and uses the largest of the two quantities in the acquisition process. A receiver cycles through pseudonoise code phases until a matched filter output exceeds a threshold. The local code is adjusted based on that code phase and the signal is processed for carrier acquisition, where an FFT estimates the carrier frequency. The code phase and nearest neighbors are used to determine the presence of a false alarm. When a false alarm is absent, the detection is examined for an alias or noise spur. If an alias is absent, the signal search is complete. Otherwise, processing continues to search for a pseudonoise code. The process continues by examining all code phases for each band until a signal is detected.
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McLeod Gene Allan
Weinberg Aaron
Aghdam Freshteh N
Burd Kevin
Edell Shapiro & Finnan LLC
ITT Manufacturing Enterprises Inc.
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