Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2007-02-27
2007-02-27
Ghebretinsae, Temesghen (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S143000, C375S343000
Reexamination Certificate
active
10164129
ABSTRACT:
A signal received by a base station is fed to a set of filters matched to spreading codes allocated to pilot channels originating from radio terminals. The outputs from the matched filters are processed so as to estimate parameters comprising, for each channel, eigenvectors representing propagation paths associated with respective amplitudes of reception along these paths. The processing of the output signals from the matched filters comprises an estimation of parameters for a first channel received with a fairly high power by the base station, a correction of the output from the matched filter of a second channel having less energy, taking account of at least one of the eigenvectors of the first channel, and an estimation of parameters for this second channel on the basis of the modified output from said matched filter.
REFERENCES:
patent: 6011812 (2000-01-01), Laakso et al.
patent: 6157811 (2000-12-01), Dent
patent: 6470044 (2002-10-01), Kowalski
patent: 2002/0034263 (2002-03-01), Schmidl et al.
patent: 2002/0152253 (2002-10-01), Ricks et al.
patent: 2002/0154705 (2002-10-01), Walton et al.
patent: 2003/0002450 (2003-01-01), Jalali et al.
patent: 1 077 551 (2001-02-01), None
Gradient eigenspace projections for adaptive filtering; Nair, N.G.; Spanias, A.S.; Circuits and Systems, 1995., Proceedings., Proceedings of the 38th Midwest Symposium on vol. 1, Aug. 13-16, 1995 pp. 259-263 vol. 1.
Improving the performance of blind CDMA 2D-RAKE receivers with phase ambiguity in the bit decision variable Stephenne, A. et al; Signals, Systems & Computers, 1998. Conf. Record of 32ndAsilomar Conf. on vol. 2, Nov. 1-4, 1998, pp. 1882-1886, vol. 2.
Highly parallel recursive/iterative Toeplitz eigenspace decomposition; Beex, A.A.; Fargues, M.P.; Acoustics, Speech, and Signal Processing, IEEE Transactions on vol. 37, Issue 11, Nov. 1989 pp. 1765-1768.
Toeplitz eigensystem solver; Yu Hu; Sun-Yuan Kung; Acoustics, Speech, and Signal Processing [see also IEEE Transactions on Signal Processing], IEEE Transactions on vol. 33, Issue 5, Oct. 1985 pp. 1264-1271.
Technical Specification 3G TS 25.211, version 3.3.0, <<Physical Channels and Mapping of Transport Channels onto Physical Channels (FDD) (Release 1999)>>, Jun. 2000, Third Generation Partnership Project.
Abdi Moussa
El Homsi Hassan El Nahas
Jard Alexandre
Ghebretinsae Temesghen
Nortel Networks Limited
Trop Pruner & Hu PC
LandOfFree
Signal processing method and apparatus for a spread spectrum... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Signal processing method and apparatus for a spread spectrum..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Signal processing method and apparatus for a spread spectrum... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3892884