On Wed, Jan 15, 2014 at 07:55:45PM -0500, Aditya Dhananjay wrote: > There is a variant of this issue that I discovered and would like to point > it out to the community. > > Synopsis: After the first time the header CRC fails, *all* subsequent > packets fail. > > Setup: > > - GRC examples of Tx/Rx OFDM > - Noise source with a variable slider to control the amount of noise. The > output of the Tx block is added with the output of the noise source. > - The output of this adder is connected to the Rx block. > > Procedure: > > - Start the experiment with 0 noise. We see that the packets are > successfully decoded. > - Increase the noise, and we observe that the packet success rate begins to > drop (payload CRC failures) > - Further increase the noise to force a header CRC failure. > - Decrease the noise back to 0. Notice that the packet success rate remains > 0, even though the noise is 0. > > This is highly repeatable. Any help would be greatly appreciated.
Hm, can't repeat it. I used the loopback example. Increasing noise does make packets drop (as expected), but setting it back makes them come again. A noise amplitude of ~2 causes most packets to fail, but some come through. What are your OFDM specs? MB _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
