El 15/5/19 a las 11:59, David Rowe escribió: > Hello Gerhard (and Glen), > > It's possible design a modem waveform to handle this channel. > > Some form or PSK to fit in 2700 Hz, but it could be single carrier as > multipath and freq selective fading is not an issue for a satellite > channel. The high symbol rate would allow fast phase tracking. > > I'm guessing the phase noise would cause frequency spreading and random > movements in the phase, a bit like the Doppler spread on HF channels. > If we have a fast enough phase tracking we can handle that. > > The OFDM modem Steve and I have developed could be modified to work on > this channel, if anyone is interested in working on it. Or they may be > other single carrier PSK modems out there (e.g. in GNU radio).
Hi David and all, I'm interested in working with this. I'm currently playing with a 2ksps 8PSK signal, designed to fit in 2700Hz and be as strong as the beacon: https://twitter.com/ea4gpz/status/1119364156715618306 I'm getting a good constellation (after all, we have around 14dB Eb/N0), so with a light FEC (maybe 8/9), achieving 5kbps is perfectly possible. Still a work in progress, but it would be good to get interest or input from other people. 73, Dani.
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