Receiver system having analog pre-filter and digital equalizer

Abstract

A receiver system suitable for a local area network contains an analog pre-filter (or), an analog-to-digital converter (), a digital equalizer (), and a decoder (). A symbol-information-carrying input analog signal (y), 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 (Z) with reduced intersymbol interference. The filtering circuitry operates according to a transfer function such as (bs+1)/(as+as+1) or (1−V)+VPF(s) where Vis 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') 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.