Re: [Discuss-gnuradio] isolate channels from wideband

I use the PFB channelizer for incoherent de-dispersion for pulsar monitoring in radio astronomy.  It's quite efficient for producing N equally-spaced channels.

For randomly-spaced, individual frequency-xlating FFT filters might be better.

 

 

 

On 2015-07-21 13:51, Richard Bell wrote:

I would add, this task you are trying to do is an advanced DSP topic. What you're looking for is a channelizer and this is optimally implemented using a polyphase filter bank. If you need a good reference on this, fred harris' book on Multirate Signal Processing for Comms Systems is a good.

http://www.amazon.com/Multirate-Signal-Processing-Communication-Systems/dp/0131465112

GNU Radio has channelizers built-in, but I've not used them yet, so I don't know how far they take you into this kind of task.

Rich

On Tue, Jul 21, 2015 at 9:17 AM, Martin Braun <martin.braun@ettus.com> wrote:

Or, given a regular channel spacing, you can use a polyphase filterbank
to split it into multiple narrow-band channels.

Cheers,
Martin

On 21.07.2015 09:10, Stephen Harrison wrote:
> A simple way in GNURadio is to use the frequency xlating fir filter to
> select individual channels.
>
> On Tue, Jul 21, 2015 at 8:39 AM, Markus Heller <heller@relix.de
> <mailto:heller@relix.de>> wrote:
>
>     Dear list,
>
>     I'd like to understand how to receive the 2m band as one wideband input
>     (144-146 MHz) and afterwards split the sample stream into various
>     channels (relay inputs, relay outputs for various relay frequencies).
>
>     I do know how to receive all of the 2m band, but I don't know how to do
>     the splitting.
>
>     How would I do that?
>
>     Thanks in advance!
>
>     br
>     markus
>     dl8rds
>
>
>
>
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