Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2003-06-24
2008-03-11
Corrielus, Jean B. (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S150000, C375S348000, C375S350000, C375S233000
Reexamination Certificate
active
07342952
ABSTRACT:
Improved decision directed adaptation and decision feedback equalizers are provided in a block coded digital communication system. The performance of a receiver is significantly improved by allowing the decision feedback equalizer to perform time-tracking and residual frequency offset compensation during the data portion of a frame. This is accomplished by capitalizing on the inherent correlation among the chips of a code word in a block coded digital communication system to identify certain instances where more reliable symbol estimates can be derived from a sliced chip without introduction the delay inherent in decoding. As the more reliable symbol estimates are fed back into the chip slicer, the total efficiency of the decision feedback equalizer is improved and the more reliable symbol estimates can be used to replace older content in the feedback filter to further improve the accuracy of the modified slicer input and further decrease the effects of error propagation by the decision feedback equalizer.
REFERENCES:
patent: 6012161 (2000-01-01), Ariyavisitakul et al.
patent: 6233273 (2001-05-01), Webster et al.
patent: 6603801 (2003-08-01), Andren et al.
patent: 6614836 (2003-09-01), Halford et al.
patent: 6647077 (2003-11-01), Shan et al.
patent: 6661857 (2003-12-01), Webster et al.
patent: 6678310 (2004-01-01), Andren et al.
patent: 6690715 (2004-02-01), Webster et al.
patent: 6700929 (2004-03-01), Shan et al.
patent: 6728324 (2004-04-01), Shan et al.
patent: 6990158 (2006-01-01), Shan et al.
patent: 7027538 (2006-04-01), Ghosh
patent: 2003/0053527 (2003-03-01), Brunel
patent: 2003/0152176 (2003-08-01), Ghosh
patent: 2004/0037380 (2004-02-01), Shan
patent: 2004/0131109 (2004-07-01), Kim et al.
patent: 2004/0146129 (2004-07-01), Lin
patent: 2004/0196933 (2004-10-01), Shan et al.
patent: 2004/0240538 (2004-12-01), Abrishamkar et al.
Smee John E.
Zhang Haitao
Corrielus Jean B.
QUALCOMM Incorporated
Rouse Thomas R.
Seo Howard
Zhu Peng
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