Patent ID: 7386061
Filing Date: 2008-06-10
Classification: H04L

Abstract:
1. A receiver front end for use in a communications system that employs digitally modulated signals operating in an upstream band of frequencies that is divided into two or more non-overlapping upstream channels, each upstream channel centered on a selected frequency within the upstream band of frequencies, wherein the selected frequencies are determined to avoid interference, the receiver front end comprising: a down-converter configured to accept a data stream comprising samples of the upstream band of frequencies sampled at a rate of at least twice the frequency of the highest selected frequency in the band and utilizing the selected frequencies to convert each of the two or more non-overlapping channels within the upstream band of frequencies to baseband, the down-converter shifting the said non-overlapping channels to a common baseline center frequency and producing a down-converted output signal for each of the said non-overlapping channels; and a decimator configured to decimate the down-converted output signals received from the down-converter.