Hi:
I think I found the problem. In my version of the GRC, there is a parameter
Type in the gr_probe_mpsk_snr block,
then I can choose it for the signal_mean,noise_variance and snr.So I think the
block output the value of the type which
I set. If I set the type as snr, the block will output the value of calculated
snr. So I think I do not use the probe_function
block.
But I still have a problem.In the block, there is a parameter alpha for the
calculation of the snr. What should I follow to
set the value of this parameter? Can anyone help me about this ?
Thank you in advance.
Inter.
From: [email protected]
To: [email protected]; [email protected]
Subject: RE: [Discuss-gnuradio] How to use the SNR block in the GRC
Date: Fri, 8 Apr 2011 18:20:59 +0800
CC:
hi josh:
Thank you for your last e-mail.I am sorry I did not mention the version of GRC
I used,and it is 3.2.2(GNU Radio is 3.3.3).
And I found the probe_function block as you said.I use a scope block to connect
to the probe_function block to see the output
of the blcok.I also put the bpsk modulated data input this block,and put the
output of the block to a file_sink.
I use the ID of the gr_probe_mpsk_snr block as the parameter Block ID of the
probe_function block, then set the parameter
Function name as the name of the functions in the gr_probe_mpsk_snr block such
as signal_mean(), snr().But there is an
error " 'gr_hier_block2_sptr' object has no attribute 'signal_mean' "in the
flow graph .Why did it happen? Did I set some parameters wrong?
Can you give me a example flow graph (not the one in the
digital-bertfolder)about the gr_probe_mpsk_snr and probe_function?
Thank you
inter
> Date: Thu, 7 Apr 2011 11:33:23 -0500
> From: [email protected]
> To: [email protected]
> Subject: Re: [Discuss-gnuradio] How to use the SNR block in the GRC
>
>
>
> On 04/07/2011 05:18 AM, intermilan wrote:
> >
> > Hi all:
> > I found these is a block gr_probe_mpsk_snr in the grc which is used to
> > measure the snr of the bpsk or qpsk signals. But I
> > do not know how to use this block.In my flow graph, I put the bpsk
> > modulated data input this block,and put the output of the block to a
> > file_sink.
> > But there is nothing in that file.So I hope someone can tell me how to use
> > this block.
> > Thanks in advance.
> > inter
> >
>
>
> I dont know what version your using. But I reworked how the probe blocks
> work since the last release, so here is how it works in the current master:
>
> Attach a probe block to your signal. Notice in the probe block docs,
> that the available functions are listed. Use the function probe block to
> read that function periodically and to write the value into a variable.
>
> To display the result, just use the ID from the function probe in the
> value parameter for the appropriate graphical widget.
>
> -Josh
>
> >
> >
> >
> > _______________________________________________
> > Discuss-gnuradio mailing list
> > [email protected]
> > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>
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