Pulse or digital communications – Receivers – Interference or noise reduction
Reexamination Certificate
2007-08-07
2007-08-07
Patel, Jay K. (Department: 2611)
Pulse or digital communications
Receivers
Interference or noise reduction
C375S233000, C375S350000
Reexamination Certificate
active
09561086
ABSTRACT:
A receiver system suitable for a local area network contains an analog pre-filter (207or619), an analog-to-digital converter (210), a digital equalizer (212), and a decoder (605). A symbol-information-carrying input analog signal (yk), or a first intermediate analog signal generated from the input analog signal, is filtered by filtering circuitry in the pre-filter to produce a filtered analog signal (Zs) with reduced intersymbol interference. The filtering circuitry operates according to a transfer function such as (b1s+1)/(a2s2+a1s+1) or (1−Vc)+VcPF(s) where Vcis adaptively varied. The analog-to-digital converter provides analog-to-digital signal conversion. The equalizer provides digital signal equalization to produce an equalized digital signal (a′k) as a stream of equalized digital values. The decoder converts the equalized digital values, or intermediate digital values generated from the equalized digital values, into a stream of symbols.
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Manickam Tulsi
Phanse Abhijit M.
Raghavan Sreen A.
Sallaway Peter J.
Wieser James B.
Lugo David B.
Meetin Ronald J.
National Semiconductor Corporation
Patel Jay K.
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