Le lun. 7 déc. 2015 à 8:06, Sylvain Munaut <[email protected]> a
écrit :
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
Hi Sylvain,
I followed your suggestion and modified the PSK (De)Mod blocks, and the
generic_(de)mod classes to add an optionnal rotation parameter, and a
Rotator block if needed, and it works great !
It also seems to be more tolerant to noisy channels.
GNU radio maintainers : should I create a pull request to add the
rotation parameter ? It would allow to have only one block for PI/4
QPSK (or PI/2 BPSK) demodulation.
Best,
Timothée.
_______________________________________________
Discuss-gnuradio mailing list
[email protected]
https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
