Setup details: USRP N210 w/SBX daugterboard UHD 3.14 GNU Radio 3.7 Ubuntu 16.04 gr-digital GNU Radio OFDM blocks used
While attempting channel estimation for 64-subcarrier OFDM, I find that for higher bandwidths, such as 20 MHz, the channel estimate shows the edge subcarriers anywhere from 15-20dB below the central zero subcarrier, even though the anticipated channel is relatively flat. Taking a larger FFT of the entire received OFDM packets shows the same rounding as seen in the channel estimation. This rounding is roughly symmetric, and occurs with any carrier frequency used. It was suggested to me that this may be caused by the antialiasing filter on the SBX board, and any further help/advice would be greatly appreciated. Is such rounding normal, and if so, how could it be compensated? Much thanks, Manav
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