Circuit for following up synchronization of a spread-coded...

Details Circuit for following up synchronization of a spread-coded... Circuit for following up synchronization of a spread-coded...

2005-06-02

2008-12-30

Tran, Khanh C (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S343000, C375S355000

Reexamination Certificate

active

07471718

ABSTRACT:
A synchronous follow-up circuit carries out correlation operation with a spread code on a receive signal, generated from a received signal in a symbol timing generator, by three symbol correlators, one for shifting the phase forward with respect to a symbol timing signal, another for synchronizing with the same and remaining one for shifting the same backward. Correlation power operators calculate respective correlation powers, and a correlation power comparator compares them with each other. The symbol timing generator adjusts the receive signal in phase on the basis of the comparison result. On the basis of the result of determining the correlation power in a correlation power decision circuit, the correlation powers are nullified, thereby preventing out-of-synchronization otherwise caused by a received signal including noise.

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patent: 06-204932 (1994-07-01), None
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