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Re: [Discuss-gnuradio] TETRA demodulator advices
From: |
Sylvain Munaut |
Subject: |
Re: [Discuss-gnuradio] TETRA demodulator advices |
Date: |
Mon, 7 Dec 2015 08:06:11 +0100 |
Hi,
> I've looked into that but I'm afraid some blocks won't play well with the
> constellation class (for example, they expect a constellation to have
> 2**(bits) points, but PI/4 DQPSK uses 2 bits and has 8 points).
> I think I will stay with the flowgraph approach for now.
I've worked with pi/4 xQPSK signals a bit when doing tetra and gmr
stuff and the approach I took is just to undo the pi/4 rotation using
a complex rotator.
Then it looks like normal QPSK and can be processed as such.
Cheers,
Sylvain