Patent ID: 6961393

Claim:
An OFDM receiver, comprising: means for recovering and sampling an RF signal from a transmitter into in-phase (I) and quadrature phase (Q) components of a baseband signal; means for computing auto correlation amplitude and phase values of the I and Q components at sample points in the baseband signal; means for averaging and saving the auto correlation values of the I and Q components of the baseband signal over L symbols for two or more frames before computing the correlation; phase lock loop means for providing a sample number indicating an OFDM frame boundary using the averaged I and Q auto correlation values based on R _ i = ∑ j = 1 L ⁢ R i ⁡ ( j ) . where: R i is the average auto correlation value; L is the latest frame; R i (j) is the auto correlation value of the j-th frame and an output signal locked to the transmitter RF signal; means providing a receiver clock chain output phase locked to the transmitter RF signal; means providing an offset value indicative of the phase difference between the receiver and a transmitter; and means for correcting frequency and timing offset between the receiver and the transmitter in the sample number.