Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2011-01-11
2011-01-11
Bocure, Tesfaldet (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S149000
Reexamination Certificate
active
07869489
ABSTRACT:
A preamble acquisition apparatus includes a first PN code generation unit for generating a first PN code having a bit string, a first correlation calculation unit for correlating a received frequency domain preamble signal with the first PN code within a first correlation range to generate a first correlation value, a first correlation value comparison unit for comparing the first correlation value with a first threshold value, a second PN code generation unit for generating a second PN code, a second correlation calculation unit for correlating the received frequency domain preamble signal with the second PN code within a second correlation range to generate a second correlation value, and a preamble acquisition determination unit for comparing the second correlation value with a second threshold value to determine whether to acquire the preamble. The bit values of the first PN code are located in the second PN code.
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Bocure Tesfaldet
H.C. Park & Associates PLC
Pantech Co. Ltd.
Williams Lawrence B
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