Pulse or digital communications – Receivers – Interference or noise reduction
Reexamination Certificate
2011-02-01
2011-02-01
Payne, David C (Department: 2611)
Pulse or digital communications
Receivers
Interference or noise reduction
C370S320000, C370S335000, C370S342000, C375S144000, C375S148000
Reexamination Certificate
active
07881412
ABSTRACT:
Techniques for performing interference cancellation in a wireless (e.g., CDMA) communication system are described. For a single-sector interference canceller, received samples are processed (e.g., despread) to isolate a signal from a transmitter (e.g., a base station) and obtain input samples. The input samples are transformed based on a first transform (e.g., a fast Hadamard transform) to obtain received symbols for multiple orthogonal channels (e.g., Walsh bins). The received symbols for the multiple orthogonal channels are scaled with multiple gains to obtain scaled symbols. The gains may be related to the inverses of the power estimates for the orthogonal channels. The scaled symbols are transformed based on a second transform (e.g., an inverse fast Hadamard transform) to obtain output samples, which are processed (e.g., spread) to obtain interference-canceled samples having the signal from the transmitter suppressed.
REFERENCES:
patent: 5551057 (1996-08-01), Mitra
patent: 6108565 (2000-08-01), Scherzer
patent: 6920192 (2005-07-01), Laroia et al.
patent: 2003/0030727 (2003-02-01), Gibbs et al.
patent: 2003/0215007 (2003-11-01), Mottier
patent: 2005/0111405 (2005-05-01), Kanterakis
patent: 0993127 (2000-04-01), None
Patel et al.; Analysis of a DS CDMA successive interference cancellation scheme using correlations; Nov. 29-Dec. 2, 1993 ; IEEE Global Telecommunications Conference; pp. 76-80.
Oppenheim et al.; Digital Signal Processing; Prentice Hall, 1975, p. 125.
Mouhouche et al, “On the Effect on Power and Channel Estimation in Equalized Blind PIC for Downlink Mulitrate CDMA Communications”, Signals, Systems, and Computers, 2004. Conference Record of the Thirty-Eighth Asilomar Conference on Pacific Grove, CA, Nov. 7-10, 2004, pp. 612-616, Piscataway, NJ, USA.
International Search Report and Written Opinion, PCT/US2006/061163, International Search Authority/EPO, Sep. 27, 2007, 15 pages.
Beladi Sayed H.
Dsouza Adolf
Payne David C
Qualcomm Incorporated
Seo Howard H.
LandOfFree
Quasi-linear interference cancellation for wireless... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Quasi-linear interference cancellation for wireless..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Quasi-linear interference cancellation for wireless... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2641749