Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2006-02-07
2006-02-07
Tse, Young T. (Department: 2637)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S344000, C455S192100
Reexamination Certificate
active
06996156
ABSTRACT:
A receiver for a code division multiple access system includes a pilot symbol producing section, a frequency offset estimating section and a local signal generating section. The pilot symbol producing section produces pilot symbols of complex vector expression from a received radio frequency (RF) signal based on a first local frequency signal and a second local frequency signal. The first local frequency signal has a frequency obtained by shifting a frequency of a carrier signal by an IF frequency and the second local frequency signal has a frequency equal to the IF frequency. The pilot symbols have been subjected to inverse modulation to remove a modulation component. The frequency offset estimating section carries out in-phase adding operations to the pilot symbols of the complex vector expression over a predetermined interval in accordance with a predetermined pattern. Then, the frequency offset estimating section carries out a complex adding operation of results of the in-phase adding operations, and determines a frequency offset from a result of the complex adding operation. The local signal generating section generates the first and second frequency signals based on the determined frequency offset.
REFERENCES:
patent: 5550811 (1996-08-01), Kaku et al.
patent: 5734639 (1998-03-01), Bustamante et al.
patent: 5805648 (1998-09-01), Sutton
patent: 5818882 (1998-10-01), Komatsu
patent: 5982763 (1999-11-01), Sato
patent: 6266361 (2001-07-01), Huang et al.
patent: 6590872 (2003-07-01), Shiue et al.
patent: 0749213 (1996-12-01), None
patent: 0810743 (1997-12-01), None
patent: 0749213 (1999-11-01), None
patent: 5-207088 (1993-08-01), None
patent: 7-202964 (1995-08-01), None
patent: 8-130565 (1996-05-01), None
patent: 8-213933 (1996-08-01), None
patent: 9-93302 (1997-04-01), None
patent: 2705613 (1997-10-01), None
patent: 10-32523 (1998-02-01), None
patent: 2771757 (1998-04-01), None
patent: 10 -126310 (1998-05-01), None
patent: 11-41141 (1999-02-01), None
patent: 11-68698 (1999-03-01), None
patent: 99/59259 (1999-11-01), None
U.K. Search Report issued Jan. 22, 2001 in a related application (in English).
Japanese Office Action issued Dec. 6, 2002 (w/ English translation of relevant part).
Japanese Office Action issued Feb. 26, 2003 (w/ English translation of relevant part).
Japanese Office Action issued Sep. 9, 2002 (w/ English translation).
Chang Edith
Dickstein Shapiro Morin & Oshinsky LLP.
Tse Young T.
LandOfFree
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