Coherent sequential PN code extractor

Details Coherent sequential PN code extractor Coherent sequential PN code extractor

1994-03-23

1996-04-02

Chin, Stephen

Pulse or digital communications

Synchronizers

Frequency or phase control using synchronizing signal

375208, 370107, H04L 700

Patent

active

055047874

ABSTRACT:
Apparatus and a method for increasing the speed of acquisition of PN coded signals includes a novel PN code clock extraction circuit which is coupled in parallel to a code tracking loop and acquisition loop of a PN receiver of the type having a replica PN code generator which is slip controlled to synchronize with the received PN coded signals. The novel PN code clock extraction circuit detects the clock transition of the received PN coded signals and synchronized the replica PN code generator clock transition signals so that there is no misalignment during acquisition. A switch control in the acquisition loop circuit senses the synchronization of the replica PN code generator transition and the received PN code transition and disconnects the PN code clock extraction circuit after synchronization of clock transition and before acquisition of the PN code so that the acquisition loop detects the PN code synchronization with a full strength signal.

REFERENCES:
patent: 4301537 (1981-11-01), Roos
patent: 4852121 (1989-07-01), Kingston et al.
patent: 4875221 (1989-10-01), Mori
patent: 5048053 (1991-09-01), Mower et al.
patent: 5105437 (1992-04-01), Kingston et al.

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