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Re: [Discuss-gnuradio] alpha =0.001 in gr.probe_avg_mag_sqrd_cf

From: Mattias Kjellsson
Subject: Re: [Discuss-gnuradio] alpha =0.001 in gr.probe_avg_mag_sqrd_cf
Date: Sun, 06 Jun 2010 00:00:16 +0200
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20100423 Thunderbird/3.0.4

On 06/03/2010 11:54 PM, Juan Quiroz wrote:
Hi all

I had a problem with tunnel.py, but changing threshold from 30dB to 50dB it was 
solved, now I'm reading receive_path.py in carrier sensing blocks are defined 
alpha=0.001 and thres=30 for use with gr.probe_avg_mag_sqrd_cf, please can 
somebody tell me what is alpha value and why is set to 0.001?
Alpha is the pole placement in the single pole IIR filter, used to filter the signal before it is compared with the threshold. Details may be found in gnuradio/gnuradio-core/src/lib/filter/gr_single_pole_iir_filter_xx.cc


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