Have a question about ofdm subcarriers and transferring data in benchmark_ofdm_tx.py

Hi,

In benchmark_ofdm_tx.py, I heard that the middle number of subcarriers
among
the occupied_tones is alloacted to carry actual data, and the frequency
band
of each subcarrier depends on the interpolation rate.
does it mean that if I change the occupied tones, I can control the
number
of subcarriers that carry actual data while having same the total number
of
subcarriers?
and if that’s true, how can I distinguish and analyze the subcarriers
which
carry data and which doesn’t carry data?
Thanks.

James,

James P. wrote:

Thanks.

James,

It seems like you’ve answered your own question. There are fft_length
number of subcarriers; the occupied_tones number of subcarriers in the
middle are used to carry data. When you set the interpolation rate, you
set the bandwidth of the output signal, but that is completely
independent of the subcarrier parameters.

Look at gnuradio-examples/python/ofdm/gr_plot_ofdm.py to visualize the
signal. Use ‘-h’ to see how to set the right parameters.

Tom

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