Re: [Discuss-gnuradio] question about a parameter in the example digial-bert

[intermilan]

Does anyone know what the parameter alpha is ? I have confused about it several days.It is a
parameter in the block gr_probe_mpsk_sbr_f. I think when we set this parameter, the ratio for
the data signal and noise should be set in the received signal.But how do I set this parameter?
Is there any rules I should follow to set this alpha parameter? If anyone knows something about
this parameter,please tell me.Thank you.

inter

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From: address@hidden
To: address@hidden
Date: Tue, 12 Apr 2011 18:50:41 +0800
Subject: [Discuss-gnuradio] question about a parameter in the example digial-bert

Hi all:
      When I look at the code in the receive_path.py which is under the digital-bert folder, I found this sentence:
       self._snr_probe = gr.probe_mpsk_snr_c(10.0/symbol_rate)
     I think this is to set the block which measure the snr of the signal. And after I read the code in the gr_probe_
mpsk_snr_c.h/.cc, I think (10.0/symbol_rate) may be the parameter alpha in the snr block.And the description about
the parameter in the block is:Mean and variance smoothing filter constant. But I do not know why should we set the
value as (10.0/symbol_rate),in other words,how should I set this value if I want use this block for other flow graph?
What rules should I follow? I hope somebody can help me for that.
    Thanks in advance.

Inter

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