Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2007-11-06
2007-11-06
Bocure, Tesfaldet (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S152000
Reexamination Certificate
active
10827481
ABSTRACT:
A plurality of communications is received. The communications are transmitted in a wireless code division multiple access format. A channel response for each received communication is estimated. A system response matrix is constructed using codes and the channel responses of the received communications. An objective matrix is produced using the system response matrix. The received communications are matched filtered to produce a first input. The first input is processed with an interference cancellation matrix to produce a first set of symbols of the received communications. The first set of produced symbols are processed with a feedback interference construction matrix to produce feedback interference. The feedback matrix added to an inverse of the interference cancellation matrix equals the objective matrix. The feedback interference is subtracted from a result of the match filtering to produce a next input. The next input is processed with the interference cancellation matrix to produce a next set symbols of the received communications.
REFERENCES:
patent: 5394434 (1995-02-01), Kawabe et al.
patent: 5822380 (1998-10-01), Bottomley
patent: 6714527 (2004-03-01), Kim et al.
patent: 6724809 (2004-04-01), Reznik
patent: 6968211 (2005-11-01), Miya
patent: 7110431 (2006-09-01), Oates
patent: 0767543 (1997-04-01), None
Klein et al., “Zero Forcing And Minimum Mean-Square-Error Equalization For Multiuser Detection in Code-Division Multiple Access Channels,” IEEE Transaction on Vehicular Technology, US, IEEE Inc., New York, vol. 45, No. 2, May 1, 1996.
Duel-Hallen A., “A Family of Multiuser Decision-Feedback Detectors for Asynchronous Code-Division Multiple-Access Channels,” IEEE Transaction on Communications, US, IEEE Inc., New York, vol. 43, No. 2/4, Part 1, Feb. 1, 1995.
Divsalar et al., “Improved Parallel Interference Cancellation For CDMA”, IEEE Transactions on Communications, vol. 46, No. 2, Feb. 1998.
Bocure Tesfaldet
InterDigital Technology Corporation
Volpe and Koenig P.C.
LandOfFree
Parallel interference cancellation receiver for multiuser... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Parallel interference cancellation receiver for multiuser..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Parallel interference cancellation receiver for multiuser... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3835986