Hi all I am currently using OFDM benchmark to generate OFDM signal under the setting of FFT len, CP length, occupied-tones and something. But I can not find out what is the real bandwidth of signal it generated. Because when I changed the Interpolation rate (sampling rate), the bandwidth at RX changed as well. Ideally we know that setting enough large sampling rate ( In USRP2, the max fs = 25MHz), I should observe the constant signal with fixed BW. It seems to me that BW of the generated signal is too large.
My question is: how to determine the BW of transmit signal in the codes? where I can change it. All I found is actual bit rate = (converter_) / xrate / samples_per_symbol = 100MHz/4/2. But this one seems not related to the BW of signal itself. Thanks for any suggestions! -- Regards, Guanbo
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