Dear Alice, the reason you're seeing all the active carriers at once is that, since the human eye is bandwidth-limited, the Qt frequency sink averages multiple FFTs.
If you want to have a real-time visualization, go for gr-fosphor, or use the Qt vector or time raster sinks; if you need offline analysis, I recommend writing the data to a file using the file sink, loading the data into python with numpy's fromfile(...., dtype=numpy.complex64), and writing your own visualization or using the specgram() tool with 0 overlap. Best regards, Marcus On 09/20/2017 01:41 PM, Alice Lo Valvo wrote: > Hi, > I'm working with the tx_ofdm.grc in the gr-digital example. I saw that > I can choose a set of > subcarriers for each OFDM symbol. Is there a way (FFT plot, for > example) to display these active subcarriers? > I tried, but FFT plot shows every active subcarriers for ALL OFDM > symbols simultaneously and not one by one in sequence. > Thanks in advance, > > Alice > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
