Excellent! Thanks for your reply Felix!
As Thomas Rondeau pointed out, the sync problem would ideally be solved with the correlate and sync block, as 802.15.4 packets have a known preamble and SFD but there might be some glitches with it. However, Thomas also optimized Costas Loop to be quite efficient now (see [1]). I'm doing a bit of experimenting on synchronization for this week and will submit a pull request to Bastian as well. Cheers, C [1] http://www.trondeau.com/blog/2014/9/1/whats-the-right-way-to-calculate-tanh.html © Sent from my Android On Feb 2, 2015 9:39 AM, "Felix W." <wunsch.fe...@googlemail.com> wrote: > Hi, > > that was me ;). I also talked to Bastian Bloessl and we agreed that I will > create a pull request to gr-ieee802-15-4 once I finish my master's thesis > and have it all cleaned up. In the meantime, you can find my fork of > Bastian's repo here: https://github.com/fewu/gr-ieee802-15-4. The branch > with my work is called css_phy. Currently I'm working on the > synchronization for the CSS PHY. My previous work focused on evaluating PHY > and MAC performance with the assumption of perfect sync. It's also not > really complete yet (e.g. preamble and PHR are dropped in the receiver > because their content is assumed to be known) and endianness might be wrong > at some points. But I will try to fix that in the next weeks. > > Feel free to contact me if you have any questions! > > Greetings > > Felix > > 2015-02-02 7:52 GMT+01:00 Christopher Friedt <chrisfri...@gmail.com>: > >> Hi list, >> >> this is just a shot in the dark, but I forgot to get the name of an >> attendee during the Internet of #allthethings talk. >> >> If you are, or know who is, the person who said he had implemented an >> 802.15.4 CSS PHY in the question period, please get in touch with me >> or pass on the message. >> >> It would be very beneficial to collect the 15.4 related work into one >> repository to reuse some amount of code. The 800 & 900 MHz PHY would >> be very useful to have in there and would be relatively painless to >> design. The CSS PHY is obviously much more interesting :-) >> >> Also, in particular, any future UWB PHY designers would be helpful. >> The SDR hardware for such a PHY might be a bit pricey. Even a >> unit-test driven PHY design would be helpful or simulation. >> >> As of this point, I have not heard of any major silicon vendors are >> even speaking about offering an UWB PHY, so it would be nice to be >> ahead of the game. >> >> Cheers, >> >> C >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> Discuss-gnuradio@gnu.org >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> > >
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