Spread PN code signal receiver

Details Spread PN code signal receiver Spread PN code signal receiver

1991-11-04

1993-01-12

Gregroy, Bernarr E.

Pulse or digital communications

Repeaters

Testing

380 34, 375120, H04L 2730

Patent

active

051795744

ABSTRACT:
A spread PN code signal receiver having a delay locked loop (DLL) circuit in an IF or RF stage characterized in that correlation outputs to be used for the DLL circuit control are (1) a correlation output between (a) a PN code advanced in phase with respect to the received signal and (b) the received signal and (2) a correlation output between (a) a PN code delayed in phase with respect to the received signal and (b) the received signal. The correlation outputs are used to detect the lock/unlock signal in the DLL circuit. In particular, AND logic for these two correlation outputs is employed to generate the lock/unlock signal only when the DLL circuit is perfectly synchronized in phase with the received signal. With this feature, a lock state can not de detected unitl a stable lock state is obtained.

REFERENCES:
patent: 3745248 (1973-07-01), Gibson
patent: 3956710 (1976-05-01), Seitz et al.
patent: 4564794 (1986-01-01), Kilen et al.
patent: 4691201 (1987-09-01), Kokubu

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