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Re: [Discuss-gnuradio] BPSK to QPSK

From: Jason Uher
Subject: Re: [Discuss-gnuradio] BPSK to QPSK
Date: Wed, 3 Mar 2010 09:51:00 -0600

> Hum... I'm glad to hear that, although I thought that the pi- phase
> ambiguity of Costas- loops made them unsuitable for QPSK-
> constellations... But I guess there is something I'm missing in the code
> then?

You aren't missing anything, you just need to account for the possible

The easy way to do this is with differential decoding, because the
instantaneous phase is irrelevant.

The harder-but-still-easy was is to transmit some know sequence at the
beginning to determine the phase offset and adjust your decoding



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