Pulse or digital communications – Receivers – Automatic gain control
Reexamination Certificate
2009-02-18
2011-12-20
Corrielus, Jean B (Department: 2611)
Pulse or digital communications
Receivers
Automatic gain control
C375S350000, C375S355000
Reexamination Certificate
active
08081720
ABSTRACT:
A communication system includes a variable gain amplifier (VGA) that receives an input signal. An analog-to-digital converter (ADC) receives an output of the VGA. A first filter responsive to an output of the ADC, the first filter includes N tap weight coefficients. A first least mean square (LMS) engine updates the N tap weight coefficients of the first filter. A second filter responsive to an output of the first filter, the second filter including M tap weight coefficients, wherein N is greater than M. An adaptation engine updates a first tap weight coefficient of the second filter based on a value of the first tap weight coefficient for a next sampling time of the input signal, a value of the first tap weight coefficient for a current sampling time of the input signal, a first gain constant, and a change in timing phase error of the first filter.
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Corrielus Jean B
Marvell International Ltd.
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