Pulse or digital communications – Receivers – Interference or noise reduction
Reexamination Certificate
2004-02-13
2009-02-10
Liu, Shuwang (Department: 2611)
Pulse or digital communications
Receivers
Interference or noise reduction
C375S350000, C375S348000, C375S284000, C375S285000, C375S254000, C375S144000
Reexamination Certificate
active
07489747
ABSTRACT:
A decision directed flicker noise canceller for reducing flicker noise in a modulated input signal according to an embodiment of the present invention includes a decision circuit, a conversion circuit, first and second adders and a filter. The decision circuit provides signal decisions based on the input signal. The conversion circuit provides selected signal values based on the signal decisions. The first adder subtracts the selected signal values from signals based on the input signal to provide a flicker noise estimate. The filter receives and filters the flicker noise estimate and the second adder subtracts the filtered flicker noise estimate from the input signal and provides a corrected input signal. In a feedback configuration, the second adder is located in a feedback position before the decision circuit in the signal processing path. In a feed-forward configuration, the second adder is located in a feed-forward position after the decision circuit.
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Baldwin Keith R.
Webster Mark A.
Yeh Alex C.
Liu Shuwang
McDonnell Boehnen & Hulbert & Berghoff LLP
Timory Kabir A
Xocyst Transfer AG L.L.C.
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