Title:
DATA-DIRECTED FREQUENCY-AND-PHASE LOCK LOOP FOR DECODING AN OFFSET-QAM MODULATED SIGNAL HAVING A PILOT
Document Type and Number:
WIPO Patent Application WO2003088509
Kind Code:
A3
Abstract:
A data-and-pilot directed frequency-and-phase lock loop for an offset-QAM modulated signal having a pilot signal comprises a pilot acquisition loop and a pair of data-directed acquisition loops. The pilot is extracted from the main signal by a pilot filter, then used both by the pilot acquisition loop and to remove the pilot from the signal to the data-directed acquisition loops. The outputs of the pilot and the two data-directed acquisition loops are summed and returned to the VCO to complete the feedback loop.
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Inventors:
CITTA RICHARD W (US)
LOPRESTO SCOTT M (US)
XIA JINGSONG (US)
ZHANG WENJUN (CN)
LOPRESTO SCOTT M (US)
XIA JINGSONG (US)
ZHANG WENJUN (CN)
Application Number:
PCT/US2003/009959
Publication Date:
February 05, 2004
Filing Date:
April 02, 2003
Export Citation:
Assignee:
LINX ELECTRONICS INC (US)
CITTA RICHARD W (US)
LOPRESTO SCOTT M (US)
XIA JINGSONG (US)
ZHANG WENJUN (CN)
CITTA RICHARD W (US)
LOPRESTO SCOTT M (US)
XIA JINGSONG (US)
ZHANG WENJUN (CN)
International Classes:
H03D3/24; H04L27/38; H04L27/00; H04B; (IPC1-7): H04L27/00
Foreign References:
| US6198777B1 | 2001-03-06 | |||
| US6415002B1 | 2002-07-02 | |||
| US6195400B1 | 2001-02-27 | |||
| US5789988A | 1998-08-04 | |||
| US5568098A | 1996-10-22 | |||
| US6034998A | 2000-03-07 | |||
| US5802461A | 1998-09-01 | |||
| US5619154A | 1997-04-08 |
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