Pulse or digital communications – Receivers – Interference or noise reduction
Reexamination Certificate
2011-01-25
2011-01-25
Fan, Chieh M (Department: 2611)
Pulse or digital communications
Receivers
Interference or noise reduction
C375S229000, C375S232000, C375S233000, C375S236000, C375S220000, C375S358000
Reexamination Certificate
active
07876866
ABSTRACT:
A method and apparatus are provided for reducing, and preferably substantially eliminating, data-pattern autocorrelations found in digital communication systems. The method employed is referred to as Data Subset Selection (DSS) and is implemented in the form of DSS engine. Autocorrelations in the data-pattern can cause many digital adaptive systems to converge to an incorrect solution. For example, the LMS method, which is often used in adaptive filtering applications, can converge to an incorrect set of filter coefficients in the presence of data-pattern autocorrelations. Digital timing recovery methods are also susceptible. Other impairments that result from data-pattern autocorrelations include increased convergence time and increased steady-state chatter. DSS reduces, and preferably substantially eliminates, data-pattern autocorrelations by selecting a subset of the data stream that either demonstrates smaller autocorrelations or no autocorrelations, thus improving the performance of the aforementioned digital adaptive systems.
REFERENCES:
patent: 3691472 (1972-09-01), Bohman
patent: 4325129 (1982-04-01), Groth, Jr.
patent: 4355366 (1982-10-01), Porter
patent: 5208665 (1993-05-01), McCalley et al.
patent: 5210770 (1993-05-01), Rice
patent: 5233635 (1993-08-01), Henriksson et al.
patent: 5852630 (1998-12-01), Langberg et al.
patent: 6134280 (2000-10-01), Matui
patent: 6570864 (2003-05-01), Kim et al.
patent: 6643374 (2003-11-01), Wells et al.
patent: 6947960 (2005-09-01), Hars
patent: 7027499 (2006-04-01), Peon et al.
patent: 7391828 (2008-06-01), Liu et al.
patent: 2004/0105512 (2004-06-01), Priotti
patent: 2004/0234002 (2004-11-01), Yang et al.
patent: 2005/0276356 (2005-12-01), Hui
patent: 2006/0101054 (2006-05-01), Dempski et al.
patent: 2008/0310484 (2008-12-01), Shattil
Boyd Graeme
Hissen Jurgen
McAdam Matthew W.
Behmann Curtis B.
Borden Ladner Gervais LLP
Fan Chieh M
Lee Siu M
PMC-Sierra US, Inc.
LandOfFree
Data subset selection algorithm for reducing data-pattern... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Data subset selection algorithm for reducing data-pattern..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Data subset selection algorithm for reducing data-pattern... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2718705