Pulse or digital communications – Synchronizers – Frequency or phase control using synchronizing signal
Patent
1997-11-12
1999-10-12
Pham, Chi H.
Pulse or digital communications
Synchronizers
Frequency or phase control using synchronizing signal
375208, H04L 700
Patent
active
059664169
ABSTRACT:
A system for recognizing degraded pseudo-random noise (PN) synchronization in a spread-spectrum receiver. The system uses a signal that indicates the correlation of the locally generated PN sequence with the received PN sequence. The correlation signal can be a symbol-length integration of the output from a square-law detector, or an appropriate similar signal. If the correlation signal is not degraded by demodulating with a deliberately shifted copy of the PN sequence, there is an indication that the unshifted PN sequence was itself not correctly synchronized. A sufficiently degraded correlation signal indicates that the receiver's PN synchronization is correct. To prevent the loss of transmitted data during the testing, each transmitted frame contains a Measurement field (that contains no payload data) for assessing the synchronization in this manner. The PN sequence is shifted only during this specific portion of the received frame.
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PCT/US 97/21369, International Search Report Nov. 21, 1997.
Bharucha Cyrus F.
Corrielus Jean B.
DSP Group Inc.
Hood Jeffrey C.
Pham Chi H.
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