That's fine for low rate stuff, but for Mehmeto's application, he probably needs to be more coherent. Correlating on a preamble would be a good idea, I think.
On Fri, Apr 28, 2017 at 9:04 AM Vitt Benv <vitt...@gmail.com> wrote: > Hi Mehmeto, > in my opinion and in my experience with LEO sats, it's usefull to retune > the receiver using doppler correction info coming from external app. > In the past I used to query old beloved Predict via socket to control a > ICOM PR1000 receiver with a little utility that I wrote ( google "pcrsat" ). > It worked fine to demodulated 1200BPSK or CW telemetry also on heavy > doppler (ovehead pass). > > Ciao, > Victor > > > 2017-04-28 13:40 GMT+02:00 Mehmeto <mehmetozcel...@gmail.com>: > >> Dear All, >> I have a situation where I need to demodulate a wide bandwidth signal (70 >> Mbps QPSK modulated, having 35 MHz IF bandwidth and sampled at 105 MSPS ) >> in >> our lab. However, the signal generator will also add some amount of >> doppler >> shift at a rate of 1 kHz/s. Which PSK demodulation blocks are suitable for >> fast demodulation under some doppler shift. I >> I know that I can not use the Costas Loop or any other block that uses a >> feedback loop because of their speed limitations. >> I am considering to add a preamble to simplify things since I know high >> speed Satellite downlinks use Preamble. I guess the use of preambles make >> demodulation easier. >> >> Please advise. >> >> >> >> -- >> View this message in context: >> http://gnuradio.4.n7.nabble.com/Which-block-for-Fast-PSK-demodulation-under-some-doppler-shift-tp63700.html >> Sent from the GnuRadio mailing list archive at Nabble.com. >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> Discuss-gnuradio@gnu.org >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > -- Very Respectfully, Dan CaJacob
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