Method and apparatus for estimating channel characteristics...

Pulse or digital communications – Spread spectrum – Direct sequence

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C375S365000, C375S130000, C370S206000

Reexamination Certificate

active

06947475

ABSTRACT:
Techniques for incorporating non-pilot symbols along with pilot symbols to improve the estimate of the characteristics (e.g., amplitude and phase) of a communication link. A pilot filter weighs samples corresponding to pilot and non-pilot symbol by different sets of coefficients, which have values determined by and/or corresponding to the confidence in the detected sample. Samples corresponding to pilot symbols are typically associated with higher degree of confidence and are weighted more (e.g., with weights of 1.0). Samples corresponding to non-pilot symbols are typically associated with lower confidence and are weighted with values that may be variable and dependent on the degree of confidence in the samples (e.g., with weights ranging from 0.0 up to 1.0). The weights are updated based on a particular estimator such as a MAP (Maximum a Posteriori) estimator, a MLE (Maximum Likelihood Estimator), or some other estimator.

REFERENCES:
patent: 5465276 (1995-11-01), Larsson et al.
patent: 5623511 (1997-04-01), Bar-David et al.
patent: 5809020 (1998-09-01), Bruckert et al.
patent: 5812542 (1998-09-01), Bruckert et al.
patent: 6219391 (2001-04-01), Nakano
patent: 6278726 (2001-08-01), Mesecher et al.
patent: 6304624 (2001-10-01), Seki et al.
patent: 6483821 (2002-11-01), Dabak et al.
patent: 6507602 (2003-01-01), Dent
patent: 6658050 (2003-12-01), Ramesh et al.
patent: 6674815 (2004-01-01), Zangi
patent: 6690713 (2004-02-01), Kim et al.
patent: 6700919 (2004-03-01), Papasakellariou
patent: 1107524 (2001-06-01), None
patent: 9611534 (1996-04-01), None
Yue et al, Performance Comparisons of Channel Estimation Techniques in Multipath Fading CDMA, May 2004, Wireless Communications, IEEE Transactions on, vol.: 3, Issue 3, pp. : 716-724.
Guenach et al, Downlink Performance Analysis of a BPSK-Based WCDMA Using Conventional Rake Receivers with Channel Estimatoin, Nov. 2001, Selected Areas in Communications, IEEE Journal on, vol.: 19, Issue: 11, pp. : 2165-2176.
Weber, Efficient Pilot-Assisted Channel Estimation for Random Access in IMT-2000/UMTS, Sep. 18-21, 2000, The 11th IEEE International Symposium on, vol.: 2, pp. 1459-1463.
Povey, et al.,A Decision-Directed Spread-Spectrum RAKE Receiver for Fast-Fading Mobile Channels: IEEE Transactions on Vehicular Technology, vol. 45, No. 3(1996).
J. Choi, et al.,Multipath CDMA channel estimation by jointly utilizing pilot and traffic channels: IEE Proc. Commun. vol. 146, No. 5 (1999).

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Method and apparatus for estimating channel characteristics... 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 estimating channel characteristics..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for estimating channel characteristics... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3405757

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.