Receiver system having analog pre-filter and digital equalizer

Details Receiver system having analog pre-filter and digital equalizer Receiver system having analog pre-filter and digital equalizer

2006-08-15

2010-02-16

Lugo, David B (Department: 2611)

Pulse or digital communications

Equalizers

Automatic

C375S348000, C375S350000

Reexamination Certificate

active

07664172

ABSTRACT:
A receiver system contains an analog pre-filter (207 or 619), an analog-to-digital converter (210), a digital equalizer (212), and a decoder (605) arranged sequentially for processing an input analog signal (yk). The pre-filter produces a filtered analog signal (Zs) with reduced intersymbol interference. The converter provides analog-to-digital signal conversion. Digital equalization circuitry in the equalizer operates according to a transfer frmnctionc-1⁢z+c0+∑Mi=1⁢ci⁢z-ito produce an equalized digital signal (a'k) as a stream of equalized digital values. Coefficients c−1and c0are fixed. Each other coefficient ciis adaptively chosen. The decoder converts the equalized digital values, or intermediate values generated therefrom, into a stream of symbols. A receiver system may include two or more receivers each configured in the foregoing way with the digital equalization circuitry in each receiver operating according to a transfer function∑i=-NM⁢ci⁢z-iwhere at least coefficients c−1, c0, and c1are non-zero.

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