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Re: [Discuss-gnuradio] Packet Decoder Breaking when adding noise

From: Achilleas Anastasopoulos
Subject: Re: [Discuss-gnuradio] Packet Decoder Breaking when adding noise
Date: Tue, 20 Nov 2018 09:10:52 -0500

It is important that you have a time scope where you compare the initial bit stream with the output of the demodulator.
These are NOT synchronized.
Unless you do that you cannot get any meaningful measurement of the BER!

You can substitute the Qt blocks with WX blocks. This is easy.


On Tue, Nov 20, 2018 at 7:36 AM Matthew J. Brandsema <address@hidden> wrote:

I don't have QT gui so I had to convert to WX blocks (how do I install QT?). I cannot get the BER to change appreciably, no matter what delay I set.  The best I can get it to is only about -1 dB.  I will keep playing with it.

From: Achilleas Anastasopoulos [address@hidden]
Sent: Monday, November 19, 2018 5:37 PM
To: Matthew J. Brandsema; address@hidden
Subject: Re: [Discuss-gnuradio] Packet Decoder Breaking when adding noise

I attach a simple grc file that works for me.

Using the delay10/delay sliders try to align the input/output bit stream.
(in this example this happens at delay=12, but it may be different for you...)

Then play with the noise variance; you will see the BER changing slowly as you go around values = -6,-5,-4

let me know if this works for you,

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