o:anas...@umich.edu>]
Sent: Tuesday, November 20, 2018 1:25 PM
To: Matthew J. Brandsema;
Discuss-gnuradio@gnu.org<mailto:Discuss-gnuradio@gnu.org>
Subject: Re: [Discuss-gnuradio] Packet Decoder Breaking when adding noise
Can you switch off the AC-coupling, and check the scope plot again
Anastasopoulos [anas...@umich.edu]
> *Sent:* Tuesday, November 20, 2018 1:25 PM
> *To:* Matthew J. Brandsema; Discuss-gnuradio@gnu.org
> *Subject:* Re: [Discuss-gnuradio] Packet Decoder Breaking when adding
> noise
>
> Can you switch off the AC-coupling, and check the scope plot again.
&g
to add another
question, I have been trying all day to get this working).
From: Achilleas Anastasopoulos [anas...@umich.edu]
Sent: Tuesday, November 20, 2018 1:25 PM
To: Matthew J. Brandsema; Discuss-gnuradio@gnu.org
Subject: Re: [Discuss-gnuradio] Packet Decoder
Can you switch off the AC-coupling, and check the scope plot again.
Also, maybe useful to have markers instead of just lines.
The two streams should be perfectly synchronized (for low noise) and as
noise gets higher
some of the demodulated bits are in error. This is perfectly OK.
Achilleas
There is something really disturbing with your plots:
The values have to be either 0 or 1 (recall they are the
transmitted/demodulated bits).
Yet, you have values in the range 0.6-0.8...
Are you sure the plots correspond to the flowgraph you posted?
Achilleas
ll keep playing
> with it.
> --
> *From:* Achilleas Anastasopoulos [anas...@umich.edu]
> *Sent:* Monday, November 19, 2018 5:37 PM
> *To:* Matthew J. Brandsema; Discuss-gnuradio@gnu.org
> *Subject:* Re: [Discuss-gnuradio] Packet Decoder Breaking when adding
Subject: RE: [Discuss-gnuradio] Packet Decoder Breaking when adding noise
Hello,
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
Anastasopoulos [anas...@umich.edu]
Sent: Monday, November 19, 2018 5:37 PM
To: Matthew J. Brandsema; Discuss-gnuradio@gnu.org
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
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 =
865-5783
>
> From: Achilleas Anastasopoulos [mailto:anas...@umich.edu]
> Sent: Monday, November 19, 2018 10:15 AM
> To: Matthew J. Brandsema ; Discuss-gnuradio@gnu.org
> Subject: [Discuss-gnuradio] Packet Decoder Breaking when adding noise
>
> ...neither do you want the extende
...@umich.edu]
Sent: Monday, November 19, 2018 10:15 AM
To: Matthew J. Brandsema ; Discuss-gnuradio@gnu.org
Subject: [Discuss-gnuradio] Packet Decoder Breaking when adding noise
...neither do you want the extended FEC encoder/decoder.
Just send random symbols through the QAM modulator, add noise
...neither do you want the extended FEC encoder/decoder.
Just send random symbols through the QAM modulator, add noise and
demodulate with the QAM demodulator.
Achilleas
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There is no reason to have packet encoder/decoder in your system if you
only want to measure BER for QAM.
Achilleas
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