Patent ID: 6201831
Filing Date: 2001-03-13
Classification: G01R,H04B,H04L

Abstract:
A feedforward equalizer for equalizing a sequence of signal samples received from a remote transmitter, the feedforward equalizer having a gain and being included in a receiver, the receiver having a timing recovery module for setting a sampling phase and a decoder, the feedforward equalizer comprising:(a) a non-adaptive filter receiving the signal samples and producing a filtered signal;(b) a gain stage coupled to the non-adaptive filter, the gain stage allowing adjustment of the gain of the feedforward equalizer by adjusting the amplitude of the filtered signal, the amplitude of the filtered signal being adjusted so as to fit in an operational range of the decoder;wherein the feedforward equalizer does not affect the sampling phase setting of the timing recovery module of the receiver;wherein the non-adaptive filter produces a precursor included in the filtered signal, the precursor being an indicator preceding each of the signal samples to facilitate timing recovery; andwherein the non-adaptive filter is a finite impulse response filter having a transfer function of the form -g+z.sup.-1, where g is a programmable constant, and where z.sup.-1 is a delayed signal sample.