Pulse or digital communications – Repeaters – Testing
Patent
1989-11-20
1991-09-10
Buczinski, Stephen C.
Pulse or digital communications
Repeaters
Testing
375115, 370107, 380 34, 329307, 329309, H04L 2730
Patent
active
050480537
ABSTRACT:
In a demodulator circuit for receiving a direct sequence spread spectrum signal having composite PN codes, there is provided a novel detecting and tracking circuit for faster acquisition of the component PN codes. The first component code of the received composite direct sequence spread spectrum code is noncoherently detected in a noncoherent detection branch and the subsequent component codes of the composite code are automatically detected in a coherent lock detection branch to provide faster acquisition than was heretofore possible. Further, while the noncoherent detection branch is acquiring the first component PN code, a novel coherent carrier tracking loop is acquiring and locking onto the direct sequence spread spectrum signal carrier.
REFERENCES:
patent: 4638494 (1987-01-01), Kartchner et al.
patent: 4776012 (1988-10-01), Zscheile, Jr. et al.
Mower Vaughn L.
Zscheile, Jr. John W.
Buczinski Stephen C.
Gregory Bernarr Earl
Scott Tomas J.
Sowell John B.
Starr Mark T.
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