Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2007-03-13
2007-03-13
Kim, Kevin (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S213000
Reexamination Certificate
active
10394404
ABSTRACT:
A method and apparatus for performing signal correlation is described. In one example, portions of a pseudorandom reference code are multiplied with portions of a repeating code of the digital signal to produce a plurality of inner products. The plurality of inner products are then integrated over a period less than a period of the repeating code to produce a correlation result with a broadened frequency response. In another example, the digital signal is correlated with a pseudorandom reference code to produce a first correlation. The digital signal is then correlated with the pseudorandom code reference code to produce a second correlation. The first and second correlations are then used to determine first and second signal delays. The frequency shift of the digital signal is computed using a difference between the first and second signal delays over time.
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Abraham Charles
de la Porte Serge
Podshivalov Sergei
Global Locate, Inc
Kim Kevin
Moser IP Law Group
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