Dynamic DC offset canceling apparatus and dynamic DC offset...

Details Dynamic DC offset canceling apparatus and dynamic DC offset... Dynamic DC offset canceling apparatus and dynamic DC offset...

2008-05-27

2011-10-04

Fan, Chieh M (Department: 2611)

Pulse or digital communications

Receivers

Automatic baseline or threshold adjustment

C375S316000, C375S346000, C375S348000, C375S349000, C375S148000, C375S147000

Reexamination Certificate

active

08031811

ABSTRACT:
The dynamic DC offset canceling apparatus includes: section104that detects dynamic DC offset in longest overlapping part sequences from the differences between the sampling values of a first longest overlapping part sequence and the sampling values of a second longest overlapping part sequence, the first longest overlapping part sequence and the second longest overlapping part sequence being overlapping part sequences in a training sequence of the received signal; section105that detects dynamic DC offset outside the longest overlapping part sequences from the difference between an average value of sampling values of a received signal which exists in a burst before the first longest overlapping part sequence, and an average value of sampling values of a received signal which exists in a burst after the second longest overlapping part sequence; and section106that adaptively subtracts a DC offset value from the received signal based on these results.

REFERENCES:
patent: 6370205 (2002-04-01), Londoff et al.
patent: 6901121 (2005-05-01), Dubrovin et al.
patent: 7035589 (2006-04-01), Meng et al.
patent: 2003/0133518 (2003-07-01), Koomullil et al.
patent: 2007/0081616 (2007-04-01), Yui et al.
patent: 2007/0281655 (2007-12-01), Ishikawa et al.
patent: 2007/0297536 (2007-12-01), Yui et al.
patent: 2000-278335 (2000-10-01), None

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