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Re: [Discuss-gnuradio] Active Cancellation

From: jan acosta
Subject: Re: [Discuss-gnuradio] Active Cancellation
Date: Mon, 21 Jun 2010 20:07:34 -0400

Well it depends, on the problem.

If you have a radio that is transmitting in the same channel as another radio, then you can directly feed one to the noise channel and receive the other at the antenna.

I know in radio astronomy people have been using this technique to cancel interference from the earth to receive signals from the stars.

I guess it is a matter of how much isolation you can get between the two.  


On Mon, Jun 21, 2010 at 4:19 PM, Kunal Kandekar <address@hidden> wrote:
I am not aware of any previous work of this type, but it's
interesting. Out of curiosity, how would you make sure the second
channel does not include the signal as well? To cancel out noise, both
receivers would need to be relatively close to each other to receive
the same noise, which means they would both receive the signal as


On Mon, Jun 21, 2010 at 2:52 PM, sirjanselot <address@hidden> wrote:
> Hey guys,
> Has anyone ever tried to make an active canceller using the USRP radios?
> Basically what I would like to do is use the USRP radio to receive two
> channels, one which has the noise and the other has the same noise + a
> signal of interest.  The goal is to use an algorithm that finds the
> coefficients of an adaptive filter to cancel out the noise in the channel
> with the signal of interest and retransmit it out.
> Please let me know.
> Thanks!
> Jan
> --
> View this message in context: http://old.nabble.com/Active-Cancellation-tp28906362p28906362.html
> Sent from the GnuRadio mailing list archive at Nabble.com.
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