Channel estimation in ofdm receivers

An OFDM receiver, comprising:

• a Fast Fourier Transform processor adapted to receive signal samples corresponding to signals received from a channel, the Fast Fourier Transform processor outputting sets of frequency domain samples, each set of frequency domain samples corresponding to a received symbol;
• a delay element coupled to receive sets of frequency domain samples and to output each of the sets of frequency domain samples following a predetermined delay interval from the output of the set by the Fast Fourier Transform processor;
• a frequency domain channel estimator coupled to receive the sets of frequency domain samples and to derive corresponding channel estimates from each of the sets of frequency domain samples, the frequency domain channel estimator outputting a sequence of channel estimates corresponding to a sequence of the sets of frequency domain samples;
• a channel estimate queue storing the sequence of channel estimates;
• a weighted averaging element coupled to the channel estimate queue to receive the sequence of channel estimates and to output an averaged channel estimate;
• and
• a frequency equalizer coupled to the delay element to receive a delayed set of frequency domain samples, the frequency equalizer coupled to the weighted averaging element to receive the averaged channel estimate, the frequency equalizer outputting an equalized set of frequency domain samples responsive to the delayed set of frequency domain samples and to the averaged channel estimate.