Patent ID: 8019036

Claim:
In orthogonal frequency division multiplexed (OFDM) multiple-in multiple-out (MIMO) wireless communications, a method for correcting sampler clock frequency offset in a receiver, the method comprising: receiving a plurality of signals; mixing the plurality of signals with a numerically controlled oscillator (NCO) signal and down-converting the mixed signals to a baseband signal filtering the mixed signals to create filtered signals buffering the filtered signals to create buffered signals removing cyclic prefix (CP) from the buffered signals; performing a fast fourier transform (FFT) on each of the CP removed received signals wherein each of the CP removed received signals is converted to a frequency domain signal; removing by a re-sampler a clocking impairment from each of the frequency domain plurality of received signals and using the clocking impairment to determine a phase offset and to create processed signals; using the phase offset to determine a frequency offset and symbol timing and to adjust the numerically controlled oscillator (NCO) signal; computing an estimated value of a fractional offset using the frequency offset and the symbol timing; and performing a correction in the frequency domain for each of the processed signals based upon the estimated value of the fractional offset.