Error detection/correction and fault detection/recovery – Pulse or data error handling – Digital data error correction
Reexamination Certificate
2005-12-27
2005-12-27
Torres, Joseph (Department: 2133)
Error detection/correction and fault detection/recovery
Pulse or data error handling
Digital data error correction
C714S795000
Reexamination Certificate
active
06981203
ABSTRACT:
A multi-user turbo decoder combining multi-user detection and forward error correction decoding is disclosed in which randomly ordered indices are assigned to interfering users before a decoding tree is constructed in the multi-user decoder for each symbol interval for every iteration and for each new block of data. By building the decoding tree in this manner for each symbol interval, a reduced complexity search is more likely to include paths (and nodes) in the tree containing the correct value for the channel symbols. All users thus share in the benefit of root level placement in the decoding tree. In an alternative embodiment of the invention only one decoding pass is accomplished and there is no re-construction of the decoding tree based on further random index ordering for iterative decoding. No modification to the transmitted signaling method is needed.
REFERENCES:
patent: 5790606 (1998-08-01), Dent
patent: 5982813 (1999-11-01), Dutta et al.
patent: 6023783 (2000-02-01), Divsalar et al.
patent: 6122269 (2000-09-01), Wales
patent: 6198775 (2001-03-01), Khayrallah et al.
patent: 6219341 (2001-04-01), Varanasi
patent: 6392572 (2002-05-01), Shiu et al.
patent: 6611513 (2003-08-01), ten Brink
patent: 2002/0184173 (2002-12-01), Olivier
PCT International Search Report dated Apr. 14, 2004 of International Application No. PCT/US03/32338 filed Oct. 9, 2003.
“Asymptotic Iterative Multi-user Detection of Random CDMA”, by Shi, et al.; ISIT 2002, Lausanne, Switzerland, Jun. 30-Jul. 5, 2002.
Bae Systems Information and Electronic Systems Integration Inc.
Funk Joseph E.
Torres Joseph
LandOfFree
Method and apparatus for random shuffled turbo 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 Method and apparatus for random shuffled turbo multiuser..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for random shuffled turbo multiuser... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3483273