Re: [Discuss-gnuradio] Spectrum management in cognitive radio

[G. Watts]

When I see discussions on cognitive radio I always ask: What are your 
plans for preventing interference to passive users of the radio spectrum 
that you won't know about if your only method of determining spectrum 
use is detecting transmissions?

Passive users of spectrum, like radio astronomy, meteorological 
radiometry, etc. do not transmit and study signals enough that a 
cognitive radio use detection system won't identify them as 'use' of the 
spectrum. Transmitting on frequencies being used by passive users will 
constitute interference of their use and likely render those frequencies 
unusable for their purposes.

I'm not attacking but hoping to raise awareness.

- Galen, W8LNA


> Date: 4 Mar 2016 16:24:54 -0000
> From: "Prabaha Biswas" <address@hidden>
> To: <address@hidden>
> Subject: [Discuss-gnuradio] Spectrum management in cognitive radio
> Message-ID: <address@hidden>
> Content-Type: text/plain; charset="utf-8"
>
> I am trying to design a cognitive radio. I have already designed an energy 
> detector as part of spectrum sensing and now I am trying to implement spectrum 
> management. So, I need to transmit a signal at those sections of the frequency 
> spectrum where the threshold block outputs a zero value. Basically I need to 
> link the output from the threshold block from the energy detector flow graph 
> with that of the USRP source such that the USRP transmits at a frequency where 
> the threshold block outputs a zero value. Is there a way to do this ?
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