L-3 Communications Corporation

Leroy Andrew Gibson, Jr

Dan M Griffin

Randal R Sylvester

Lyman D Horne

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 I&#x2013;I, and quadrature phase Q&#x2013;Qsignals, wherein each I&#x2013;Iand each Q&#x2013;Qsignal contains at least one sync bit and n&#x2267;2. The at least one sync bit from each I&#x2013;I, and quadrature phase Q&#x2013;Qsignals are summed to form sums Iand Q, respectively. The next step provides a reference sync having at least one bit and compares each sum Iand Qwith the at least one reference bit. The results of each Iand Qcomparison are accumulated so as to form two accumulates, Iand Q, respectively. Each accumulate Iand Q, is squared to form Iand Qfrom which the sum Iand Qis formed. The sum I+Qis compared with a predetermined threshold and as a result of the comparison a determination of whether frame sync has been achieved is made.

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Riverton, UT, United States of America

Leroy Andrew Gibson, Jr