James Park wrote:
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,
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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