Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2006-09-18
2008-11-25
Vo, Don N (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S232000, C375S350000
Reexamination Certificate
active
07457351
ABSTRACT:
Cancellation of interference in a communication system with application to S-CDMA. A relatively straight-forward implemented and computationally efficient approach of selecting a predetermined number of unused codes is used to perform weighted linear combination selectively with each of the input spread signals in a multiple access communication system. If desired, the predetermined number of unused codes is always the same in each implementation. Alternatively, the predetermined number of unused codes is selected from within a reordered code matrix using knowledge that is shared between the two ends of a communication system, such as between the CMs and a CMTS. While the context of an S-CDMA communication system having CMs and a CMTS is used, the solution is generally applicable to any communication system that seeks to cancel narrowband interference. Several embodiments are also described that show the generic applicability of the solution across a wide variety of systems.
REFERENCES:
patent: 5784415 (1998-07-01), Chevillat et al.
patent: 6298035 (2001-10-01), Heiskala
patent: 6385255 (2002-05-01), McLaughlin et al.
patent: 2003/0081670 (2003-05-01), Bologna et al.
patent: 2004/0071222 (2004-04-01), Liang et al.
Currivan Bruce J.
Kolze Thomas J.
Ungerboeck Gottfried
Yousef Nabil R.
Broadcom Corporation
Garlick & Harrison & Markison
Short Shayne X.
Vo Don N
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