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

[Dan CaJacob]

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 <address@hidden> 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 <address@hidden>:

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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Very Respectfully,

Dan CaJacob