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

[Mehmeto]

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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