Multiplex communications – Communication over free space – Having a plurality of contiguous regions served by...
Reexamination Certificate
2001-09-10
2008-09-30
Shah, Chirag G. (Department: 2616)
Multiplex communications
Communication over free space
Having a plurality of contiguous regions served by...
C370S342000, C370S441000, C375S147000, C375S148000
Reexamination Certificate
active
07430191
ABSTRACT:
Techniques to acquire and track a received signal instance (or multipath) based on one or more transmitted pilots. In an aspect, a frequency tracking loop is provided to acquire and track the multipath, and supports a number of loop modes (e.g., acquisition and tracking modes). Each loop mode may be associated with a respective frequency detector and a set of values for a set of elements in the loop. In another aspect, several frequency detectors are provided for deriving estimates of the frequency error in the downconversion of the multipath (e.g., from radio frequency to baseband). In one design, maximum likelihood estimates of the frequency error are derived based on the recovered pilot symbols. In another design, the frequency error estimates for the multipath are derived based on the frequency error estimated for each transmitted signal.
REFERENCES:
patent: 4644526 (1987-02-01), Wu
patent: 5640431 (1997-06-01), Bruckert et al.
patent: 5764687 (1998-06-01), Easton
patent: 5812615 (1998-09-01), Baum et al.
patent: 5943329 (1999-08-01), Ohgoshi et al.
patent: 6363102 (2002-03-01), Ling et al.
patent: 6373861 (2002-04-01), Lee
patent: 6456609 (2002-09-01), Ohgoshi et al.
patent: 6671334 (2003-12-01), Kuntz et al.
patent: 6791964 (2004-09-01), Hwang et al.
patent: 6891883 (2005-05-01), Sourour et al.
patent: 6940875 (2005-09-01), Mesecher et al.
patent: 2002/0003788 (2002-01-01), Ohgoshi et al.
patent: 2002/0009064 (2002-01-01), Blessent et al.
patent: 2002/0181391 (2002-12-01), Wang
patent: 2002/0196768 (2002-12-01), Ohgoshi et al.
patent: 2003/0021247 (2003-01-01), Sendonaris
patent: 2003/0128678 (2003-07-01), Subrahmanya et al.
patent: 2004/0032842 (2004-02-01), Mesecher et al.
patent: 2004/0163120 (2004-08-01), Rabenko et al.
patent: 2004/0252678 (2004-12-01), Rabenko et al.
patent: 2005/0013350 (2005-01-01), Coralli et al.
patent: 0065797 (2000-11-01), None
patent: 0154287 (2001-07-01), None
Sendonaris Andrew
Subrahmanya Parvathanathan
Baker Kenneth D.
Huffaker David J.
QUALCOMM Incorporated
Rouse Thomas R.
Shah Chirag G.
LandOfFree
Method and apparatus for performing frequency tracking based... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for performing frequency tracking based..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for performing frequency tracking based... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3985615