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Re: [Discuss-gnuradio] Pi/4 Mod-Demod

From: Sylvain Munaut
Subject: Re: [Discuss-gnuradio] Pi/4 Mod-Demod
Date: Fri, 10 Oct 2014 12:12:46 +0200


> I’m interested in, and looking into the Pi/4 QPSK modulation technique
> (http://en.wikipedia.org/wiki/Phase-shift_keying#.CF.80_.2F4.E2.80.93QPSK).
> 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 ?



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