Synchronizing position detecting circuit

Details Synchronizing position detecting circuit Synchronizing position detecting circuit

2007-10-23

2007-10-23

Fan, Chieh M. (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S148000, C375S149000, C455S436000, C455S456500, C455S515000

Reexamination Certificate

active

10684831

ABSTRACT:
A synchronizing position detecting circuit includes a window size determining circuit, a synchronizing code generating circuit, a correlation circuit and a synchronizing position determining circuit. The window size determining circuit calculates a moved distance of a mobile station during a sleep time based on a moving speed and the sleep time and selects a window size based on a phase change of a distance signal corresponding to the moved distance. The code generating circuit repeatedly produces a synchronizing code that coincides with a part of a code of the distance signal and successively shifts a phase of the synchronizing code by a predetermined phase width so as to shift the window size. The correlation circuit calculates a correlation function between the synchronizing code and the distance signal. The position determining circuit determines a correlation function having a maximum value to detect the distance signal and outputs a synchronizing position signal representing a detecting position.

REFERENCES:
patent: 7089004 (2006-08-01), Jeong et al.
patent: 2001/0051527 (2001-12-01), Kuwahara et al.
patent: 2002/0120766 (2002-08-01), Okajima et al.
patent: 2003/0134652 (2003-07-01), Ben-Eli

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