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From: | Martin Braun |
Subject: | Re: [Discuss-gnuradio] IQ changing with restart |
Date: | Tue, 11 Feb 2014 09:19:03 -0800 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0 |
On 11.02.2014 09:14, SOUTHCOTT, MARK A CIV USAF AFMC AFRL/RITC wrote:
This is QPSK, and I have looked at the constellation diagram after carrier recovery, matched filtering and timing recovery. The constellation is a clean qpsk signal at that point. I've done radar work before and this doesn't "feel" like a phase shift from the LO (not a great reason to discredit it). Also, possibly due to a difference in the physical architecture, when I used a common clock between tx and rx in my radar work the initial phase alignment was repeatable.
Your const plot was before the phase recovery? And if yes, was it rotated? MB
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