Re: [Discuss-gnuradio] Which block for Fast PSK demodulation under some doppler shift?

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 <mehmetozcelebi@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.



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