Hi Francisco - If you read through "gr-digital/python/ofdm.py" carefully (lines 68:81), you'll find that the number of "occupied tones" cannot be more than 4512 because of the way the known preamble symbols are pre-generated; feel free to regenerate these symbols to as many as you want, but make sure to use the new symbols on both the Tx and Rx for proper transmission. There is no check for this value, and the Python script will set the resulting preamble to length 4512 when the number of occupied tones is greater than 4512. So, even if you set in GRC to not use preambles, one is always created through the known symbols. It wouldn't be too difficult to tweak this Python script to properly expand the known symbols' part of the preamble to be of the correct length; please feel free to do this tweaking & submit a patch. Good luck. - MLD
On Jul 16, 2012, at 4:17 AM, frankist wrote: > Thanks for the response. I am using the GRC and I let the preamble size=0. > When I use a lower number of occupied tones this error doesn't occur. > However if I used the values specified in the first post that message > appears _______________________________________________ Discuss-gnuradio mailing list [email protected] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
