Pseudonoise code pull in circuit

Details Pseudonoise code pull in circuit Pseudonoise code pull in circuit

1997-03-13

1998-10-13

Tu, Trinh L.

Excavating

371 471, 371 272, G06F 1100

Patent

active

058223320

ABSTRACT:
A pseudonoise (PN) code pull in circuit is capable of shortening a time necessary for synchronously pulling in the reception PN code in an error code measuring circuit. In order to solve the problem, the PN code pull in circuit of the invention is constructed such that the reference PN code read out by the PN code generating circuit in the reverse sequence and the reception PN code are compared by a first comparator to detect a coincidence, and the reception PN code delayed for one clock and the reference PN code are compared by a second comparator to detect a coincidence. Furthermore, from the comparison results by the first and second comparators, one that is coincident is selected by the selection circuit, the error number of the code is counted by the error counter, and the forward or reverse sequence of the PN code generated by the PN code generating circuit is made switchable.

REFERENCES:
patent: 4232387 (1980-11-01), Cottatellucci
patent: 4788696 (1988-11-01), Sakane et al.
patent: 5455536 (1995-10-01), Kono et al.
patent: 5619509 (1997-04-01), Maruyama et al.

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