Hi ARob, You're right to presume that – because that's how the math behind the DFT works out! So, no, you can't change that.
What you can do, of course, make a system with the correct resulting sampling rate (as calculated from desired spacing times number of bins), and just resample that to the rate you need. Alternatively, and that's what you probably want: Calculate the FFT length so that you get your desired channel spacing giving your sampling rate, and use the carrier map to just use the (typically center, aside from DC) ones that you need. Best regards, Marcus On Wed, 2019-02-27 at 13:00 -0600, Alex Roberts wrote: > Hello GNURadio Users, > > Is it possible to specify the frequency spacing of the carriers in the OFDM > Transmitter Block or Carrier Allocator block? My assumption is the carrier > spacing is calculated from the sampling rate and the FFT length (e.g, if > sampling rate is 640k and fft length is 64, is the frequency spacing 10 kHz). > It would be nice to have the capability to manually define the frequency bin > spacing. > > Thanks, > ARob > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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