Patent ID: 8447001

Claim:
An apparatus for performing channel estimation on a time-domain received signal through a channel, and a frequency-domain received signal corresponding to the time-domain received signal, the apparatus comprising: a time-domain estimating circuit to perform a channel estimation on the time-domain received signal in the time domain to output a time-domain estimated signal representing an estimation of a characteristic of the channel; a first frequency-domain converting circuit to convert the time-domain estimated signal into a frequency-domain estimated signal; an error computing circuit to produce an error signal based on the frequency-domain estimated signal and the frequency-domain received signal; and a compensation circuit to compensate the frequency-domain estimated signal in the frequency domain using the error signal so as to produce a final channel estimation signal representative of the characteristic of the channel; wherein the error computing circuit comprises: a decision slicer to produce a decision signal based on a frequency-domain recovered signal generated from the frequency-domain received signal and the final channel estimation signal; a dividing circuit to generate a frequency-domain training signal based on the frequency-domain received signal and the decision signal; and a subtraction circuit to generate the error signal according to the frequency-domain estimated signal and the frequency-domain training signal.