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Re: [Discuss-gnuradio] Received signal is DANCING

From: Steven Clark
Subject: Re: [Discuss-gnuradio] Received signal is DANCING
Date: Thu, 18 Nov 2010 11:20:57 -0500

On Thu, Nov 18, 2010 at 6:34 AM, Songsong Gee <address@hidden> wrote:
I am now building a flow graph for ASK modulation,during the test,

Here is my flow graph, http://picasaweb.google.com/lh/photo/-4xnI_UgFeSNENH3UGHgxw?feat=directlink

And this is the result plot, http://picasaweb.google.com/lh/photo/QYy5NJEezHCqaMX-8AIFww?feat=directlink

The bottom is the RX signal. As you can see, RX is not similar with TX, even worse, it is dancing!

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What does the resulting plot look like if you remove the bandpass filter? Those discontinuities when the orig signal abruptly turns on/off is essentially high-frequency info, which when filtered out by whatever means, will result in a rx signal that is distorted from the original.

Also, why do you have a throttle? You have a USRP sink, let its Interp factor be the rate-determiner.


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