Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2007-08-28
2007-08-28
Ha, Dac V. (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S148000, C375S349000
Reexamination Certificate
active
10331783
ABSTRACT:
An interference canceller is herein disclosed wherein a baseband signal is input to a detector's fingers, and the fingers detect multi-path signals and estimate the baseband signal's channel. An MRC uses the finger's despread signal and the channel estimate to output a soft bit decision value, while a signal regenerator uses a hard bit decision value and the finger's channel estimate to regenerate the baseband signal. An SIR measurer uses a soft bit decision value and a despreader's channel estimate to measure an SIR. A signal selector compares each detector's SIR measurement value with a target SIR, and when the SIR measurement value is greater than the target SIR, it selects the detector's regeneration signal to group received signals. A subtractor subtracts the regeneration signal from the baseband signal.
REFERENCES:
patent: 5467368 (1995-11-01), Takeuchi et al.
patent: 6034952 (2000-03-01), Dohi et al.
patent: 6088383 (2000-07-01), Suzuki et al.
patent: 6473451 (2002-10-01), Seki et al.
patent: 2001/0019577 (2001-09-01), Ha
patent: 2002/0012383 (2002-01-01), Higuchi et al.
patent: 10-1999-0054870 (1999-07-01), None
patent: 10-0255565 (2000-02-01), None
patent: WO 00/49724 (2000-08-01), None
Seong Rag Kim et al., “Multi-Mode Subtractive interference Cancellation for Asynchronous Multi-Path Channels,” 1999 IEEE, pp. 1430-1434.
Dariush Divsalar et al., “Improved Parallel Interference Cancellation for CDMA,” 1998 IEEE, pp. 258-268.
Carl S. Wijting et al.; “Groupwise Serial Multiuser Detectors for Multirate DS-CDMA”; 1999 IEEE.
Seong Rag Kim et al.; “Multi-Mode Subtractive Interference Cancellation for Asynchronous Multi-Path Channels”; 1999 IEEE; pp. 1430-1434.
A.F. van Meeteren et al.; Groupwise Weighted Parallel Interference Cancellation for Asynchronous Multirate DS-CDMA; 1999 IEEE; pp. 1820-1824.
Choi In-Kyeong
Choi Jin-Kyu
Kim Seong-Rag
Electronics and Telecommunications Research Institute
Ha Dac V.
Lowe Hauptman & Berner LLP
LandOfFree
Interference canceling device and method in mobile... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Interference canceling device and method in mobile..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Interference canceling device and method in mobile... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3884010