Re: [Discuss-gnuradio] QPSK Demodulator

[Tom Rondeau]

Pepito31 Pepito31 wrote:
> Hi all,
> I'm working on a qpsk demodulator (not differential), see code below :
>
>
>   

> I would like to know if rot has to be set to 1 or 0.707 + 0.707j as I
> have removed the diff_phasor ?
> When I draw the constellation after the clock_recovery block, I see
> graphicaly that the symbol are located around +45°, 135°,225°,-45°.
>
> Best regards,
>
> Pepito
>   

Pepito,

Remember that a phase shift is just a phase shift and nothing special. 
The information is in the relative position of the constellation points 
to each other. You just have to make sure that the receiver knows how to 
slice the constellation once the phase locking has been accomplished.

Tom