Hello All, I am trying to generate OFDM signals of various bandwidths using the X300 (UBX-160), particularly 20/40/80 and 160 MHz bandwidths. I have used the gnuradio ofdm_tx.grc example file to generate a data file which I then feed into the USRP an monitor on a spectrum analyzer.
To quickly note, I do not care about the data being transferred, it will not be received or demodulated in any way and is simply an interfering signal. At this time I can produce a 20 MHz wide OFDM signal as well as a 100 MHz wide signal (?) but the 40/80 MHz signals are rounded and look more like an 802.11b signal. I have noted a message from the X300 that the requested sample rates (40/80 MS respectively) cannot be achieved due to the 200/x ratio being odd. So my question is this, how do I decouple the USRP's sample rate with the bandwidth of the signal I am trying to produce? To put it another way, I produce a data file at 40 MS/s rate then run it on the X300 at 100 MS/s and I get a 100 MHz wide signal instead of the 40 MHz I want. Thanks for the help. ----------------------------- Jacob Knoles
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