Patent ID: 7106709

Claim:
A radio receiver system comprising: a radio receiver which receives plural modulated radio frequency carriers and produces therefrom a modulated base-band signal, the plural modulated radio frequency carriers having been transmitted by a radio transmitter operating in accordance with a transmitter sample clock; a receiver sample clock which is used for sampling the modulated base-band signal; a timing correction unit which performs in the frequency domain a timing drift compensation between the transmitter sample clock and the receiver sample clock; a demodulation section which comprises the timing correction unit, and wherein the dcmodulation section further comprises: a frequency offset estimation unit which outputs a frequency offset estimation; frequency correction unit which receives the modulated base-band signal and outputs a frequency corrected modulated base-band signal; a fast Fourier transform (FFT) unit which receives the frequency corrected modulated base-band signal and outputs a frequency domain modulated subcarrier signal; a channel estimation unit which uses the frequency corrected modulated base-band signal to generate a frequency domain channel estimate which is applied to the timing correction unit; wherein the timing correction unit generates a time corrected channel estimate; a demodulator which uses the frequency domain modulated subcarrier signal and the time corrected channel estimate to generate a demodulated signal.