Patent ID: 7200188
Filing Date: 2007-04-03
Classification: H04L

Abstract:
1. A frequency offset compensated receiver for an RE signal, said RE signal comprising a modulation with in-phase (I) and quadrature (Q) components on a carrier signal, said carrier signal having a carrier frequency, said receiver comprising: a local oscillator (LO) which provides an LO signal at an LO frequency that is subject to offsets from said carrier frequency, an extraction circuit connected to derive a demodulated signal from said RE signal based upon said LO signal, and a frequency offset (FO) compensation circuit connected to adjust the phase of said derived demodulated signal to compensate for offsets, between said carrier and LO frequencies, said FO compensation circuit including an FO determination circuit connected to determine the offset between said carrier and LO frequencies, wherein said extraction circuit outputs I and Q components of said demodulated signal, and said FO determination circuit produces signals FOI and FOQ which correspond to the FOs associated with said I and Q components, respectively, and adjusts said I and Q components based upon FOI and FOQ.