Hello sir Thank you for your reply. Well, I am trying to do some additional operation to the receiver side of the OFDM transceiver (rx_OFDM). I am intending to detect a doppler shift in the received signal, for which I am trying to do an FFT over symbols collected in 1 second. To test the case, I tried to do a large FFT over 4 same OFDM symbols, which means a 4 x 64 FFT, which should give me 48 (corresponding to occupied tones) peaks instead of a band.
The theory of peaks can be illustrated simply by the FFT theory. I can share the reference for that if needed. I hope I am clear here. On Sun, Jan 3, 2016 at 7:06 PM, Martin Braun <martin.br...@ettus.com> wrote: > Typically, you'd do 1 (I)FFT per OFDM symbol. I recommend having a look > at the tx_ofdm.grc and rx_ofdm.grc examples, which show a full flow graph. > > M > > On 01/03/2016 01:22 PM, Aditya Virmani wrote: > > Hello everyone > > > > Iam trying to do run-time FFT over multiple OFDM symbols. > > For this, I feed in the same sequence of bytes for each OFDM symbol. > > As per my understanding, as I am feeding in the same sequence of bytes, > > it should be generating same set of symbols, and then further if we do > > FFT over multiple symbols which are same, we should get a sequence of > > peak-and-zeros, instead of continuous FFT graph. > > This works fine if I do just with two symbols (screenshot of that > > attached), but when I feed in more than two, it results in error ( I > > think that the data doesn't reach the FFT block concurrently, because > > the graph I get is same when I feed Null source and a Symbol source to > > FFT). > > > > It would be great if someone can guide me with it. > > > > > > Regards > > Aditya Virmani > > > > > > _______________________________________________ > > 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 >
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