Method of providing a data signal for channel estimation and circuit thereof

A method of providing a resultant frequency domain signal based on a time domain signal having pilots useful in estimating a channel through which the time domain signal traveled, comprising:

• obtaining an input frequency domain signal derived from the time domain signal;
• providing a first estimate of the channel using pilots from the input frequency domain signal;
• determining an autocorrelation based on the first estimate of the channel;
• adding extension signals to the first estimate of the channel based on the autocorrelation to obtain a second estimate of the channel;
• using, which includes performing an inverse fast Fourier transform and a fast Fourier transform, the second estimate of the channel to obtain a third estimate of the channel;
• and
• using the third estimate of the channel on the input frequency domain signal to provide the resultant frequency domain signal.

A circuit for providing a resultant frequency domain signal in response to a time domain signal having pilots useful in estimating a channel through which the time domain signal traveled, comprising:

• means for obtaining an input frequency domain signal derived from the time domain signal;
• means for providing a first estimate of the channel using pilots from the input frequency domain signal;
• means for determining an autocorrelation based on the first estimate of the channel;
• means for adding extension signals to the first estimate of the channel based on the autocorrelation to obtain a second estimate of the channel;
• means for using, which includes performing an inverse fast Fourier transform and a fast Fourier transform, the second estimate of the channel to obtain a third estimate of the channel;
• and
• means for using the third estimate of the channel on the input frequency domain signal to provide the resultant frequency domain signal.