Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2006-10-31
2006-10-31
Kim, Kevin (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S368000
Reexamination Certificate
active
07130333
ABSTRACT:
A method and device for frame sync detection using signal combining and correlation. The method comprises the steps of despreading PN coded signals to provide in-phase I1–In, and quadrature phase Q1–Qnsignals, wherein each I1–Inand each Q1–Qnsignal contains at least one sync bit and n≧2. The at least one sync bit from each I1–In, and quadrature phase Q1–Qnsignals are summed to form sums Is1and Qs1, respectively. The next step provides a reference sync having at least one bit and compares each sum Is1and Qs1with the at least one reference bit. The results of each Is1and Qs1comparison are accumulated so as to form two accumulates, IAand QA, respectively. Each accumulate IAand QA, is squared to form IA2and QA2from which the sum IA2and QA2is formed. The sum IA2+QA2is compared with a predetermined threshold and as a result of the comparison a determination of whether frame sync has been achieved is made.
REFERENCES:
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patent: 6064690 (2000-05-01), Zhou et al.
patent: 6707846 (2004-03-01), Iwamatsu
Gibson, Jr. Leroy Andrew
Griffin Dan M.
Horne Lyman D.
Sylvester Randal R.
Harrington & Smith ,LLP
Kim Kevin
L-3 Communications Corporation
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