________________________________________ From: discuss-gnuradio-bounces+julien.olivain=lacime.etsmtl...@gnu.org [discuss-gnuradio-bounces+julien.olivain=lacime.etsmtl...@gnu.org] on behalf of Martin Braun (CEL) [martin.br...@kit.edu] Sent: Wednesday, November 14, 2012 12:29 PM To: discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] Paper: DCSK chaotic modulations with GNU Radio.
On Tue, Nov 13, 2012 at 07:31:30PM +0000, julien.oliv...@lacime.etsmtl.ca wrote: > Feedback and comments are welcome. If somebody thinks this has a > place in the main repo, let me know what remain to be done. Out of curiosity, how were you able to determine Eb/N0 in Fig. 3? Could you use the SNR measurement blocks in GNU Radio? ________________________________________ Hi Martin, Basically, we measured everything "by hand", using the standard block in GNU Radio 3.5 (plus some modifications in the "simple framer"). So, no, we didn't use the SNR estimation blocks in GNU Radio (if I remember well, these blocks were not merged in GNU Radio when we did these experiments, last year). We had the setup described in section 5 of the paper (2 usrp, a noise generator with a mixer). For each point of the graph, we measured the noise power alone, the signal power alone, then the bit error rate when mixing the noise and the signal. With some matlab code we converted the SNR to Eb/N0 to generate the Fig 3 (instead of using a SNR estimation technique). We did this because we wanted to actually measure the total performance loss of the whole transmission system (modulation, implementation, sync. recovery, usrp) and compare the results with the theoretical limits. Moreover, I have no idea how far is a usrp transmit channel from a pure theoretical AWGN one. Other things that would be nice to test would be to compare this "hand made" SNR measures with SNR estimation techniques, both in a lab setup and in a real-world outdoor environment. -- Julien Olivain. _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
