Patent ID: 7142618

Claim:
A receiver for processing a received signal, the received signal including symbols and a frequency offset from baseband, the receiver generating a frequency offset estimate, the receiver comprising: means for filtering the received signal to produce a filtered signal, whereby said filtering introduces inter-symbol interference (ISI) in the filtered signal; means for converting the filtered signal to a baseband signal that is substantially free of the frequency offset and the ISI, responsive to the frequency offset estimate and a restorative signal that compensates for the ISI, wherein the means for converting the filtered signal to a baseband signal includes: means for frequency-shifting the filtered signal toward baseband by an amount equal to the frequency offset estimate; and means for reducing the ISI responsive to the restorative signal; means for detecting symbols in the baseband signal to produce a decision signal; and means for generating, from the decision signal, the restorative signal responsive to the frequency offset estimate, such that the restorative signal compensates for the ISI, wherein the means for generating the restorative signal includes: means for frequency-shifting the decision signal away from baseband by an amount equal to the frequency offset estimate to produce a frequency-shifted decision signal; and means for filtering the frequency-shifted decision signal to produce the restorative signal.