Hello, I m currently simulating a channel estimation based preamble in OFDM system. The ofdm signal is convolved with the channel taps which is in this case 3 taps. The technique is to correlate the received preamble with its local copy in time domain before FFT. This kind of correlation should give an impulse as the result and in this matter, these impulses should be the channel taps. But there is a problem to catch the desired impulses since its amplitude is lower than the correlation sidelobe near the main peak correlation. This is due to the zeros that padded on both side of the preamble as guardbands. Since the guardbands are should be there, then this problem seems difficult to deal with. The guradbands appear in higher amplitude compare to the other sidelobe correlation. Is there anyone can explain how to deal with this? Thank you.
Effect of guardbands ofdm preamble on crosscorrelation
Started by ●December 12, 2008