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Johann T. johann.tzt at gmail.comHi Sylvain, Thank you for getting back to me. I suspected it would not be easy to decode the uplink speech and you confirmed that. I will probably not spend more effort on it. Your code and suggestions have helped me a lot. I have decoded my own downlink speech and now the RACH. Thanks again for your help. Best regards, Johann On Thu, Jul 1, 2021 at 10:14 AM Sylvain Munaut <246tnt at gmail.com> wrote: > Hi, > > > Thanks to your suggestions, I managed to decode the RACH from the > captures on L-band. I just had to tweak a few parameters in the graphs. I > have decoded the Paging Response and Location Update messages. > > TBH I'm impressed you managed to decode those from uplink without the > sync from the downlink channels. > > > Do you have some suggestions on decoding the uplink speech? On the > downlink, the code follows the Immediate Assignment and decodes the traffic > channel. Due to the limitation of the SDR, I am not able to capture both > the downlink and uplink channels simultaneously. > > Not really, they are already tricky to get from downlink because they > are very small, use crappy sync patterns and have very little error > correction applied, so on uplink that's going to make it even harder. > > Cheers, > > Sylvain > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/gmr/attachments/20210702/1caca07d/attachment.htm>