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 <[email protected]>: > 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 > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >
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