Pi/4 Mod-Demod

GNU Radio
1

All,

I’m interested in, and looking into the Pi/4 QPSK modulation technique
(Phase-shift keying - Wikipedia).

Has anyone worked on this before and does anyone have any blocks or code
that I could use for reference while making my own? Any help, links,
blocks or code would be greatly appreciated!

Thanks,
Luke

2

Hi,

I’m interested in, and looking into the Pi/4 QPSK modulation technique
(Phase-shift keying - Wikipedia).

Has anyone worked on this before and does anyone have any blocks or code
that I could use for reference while making my own? Any help, links, blocks
or code would be greatly appreciated!

Just rotate it by pi/4 using a rotator block, then treat it as QPSK
(for which there are GR blocks).

It’s not a GR block but I work with pi/4 whithin the osmo-gmr project.

What’s the target application ? Is it bursts or a continuous signal ?

Cheers,

Sylvain

3

Osmo-Tetra uses Pi/4-DQPSK:

Mike

–
Mike J. M0MIK BSc MIET
Email: [email protected]
Web: http://scanoo.com

On Fri, Oct 10, 2014 at 11:05 AM, PEEL Luke
[email protected]