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Re: [Discuss-gnuradio] IQ changing with restart

From: George
Subject: Re: [Discuss-gnuradio] IQ changing with restart
Date: Tue, 11 Feb 2014 12:02:07 -0500

Is it an over-the-air transmission or TX and RX are connected with a wire and attenuators?

George Sklivanitis
PhD Student and Research Assistant
Signals, Communications, and Networking Research Group
Department of Electrical Engineering
University at Buffalo, The State University of New York

Office: 238 Davis Hall, Buffalo, NY 14260

Web: http://www.buffalo.edu/~gsklivan

On Feb 11, 2014, at 11:57 AM, Martin Braun <address@hidden> wrote:

On 11.02.2014 06:19, Sylvain Munaut wrote:

I've done my homework on this one, crawled through the web & talked to
colleagues. If I am missing something obvious please point it out - it's not
for lack of effort on my part!

I'm not really sure what you're expecting. Of course the phase
alignement between the Tx and Rx is going to be random depending on

Using the same clock will prevent it from drifting, but the initial
phase alignement is random. This is usually resolved by using training
sequence, headers, differential encoding, ...

I had the same thought -- it looks like a phase change. This is a PSK signal, right? Have you looked at the constellation diagram?


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