Re: [Discuss-gnuradio] hi all, can I use one RX receive a wideband signal and then seperate it to many narrowband signals

[Nick Foster]

Short answer: you can go as wide as your CPU will handle.

If you only need a few channels but they're separated by a few MHz, use
the frequency xlating filters to bring each channel to baseband. If you
have a regularly-spaced band, use the channelizer.

--n

On Tue, 2010-12-21 at 14:10 -0500, Walker, Robert CIV NWDC, Science
Advisor wrote:
> On Tue, Dec 21, 2010 at 06:02:44PM +0800, James Jordan wrote:
> > Hi all, I need to receive many narrowband signals, but usrp hard ware only
> > provide 4 RX,
> > so I need to receive more than one narrowband signals per RX. Is my idea
> > possible?
> > I dont want to use more than one usrp to achieve that, anyway which will be 
> > an
> > option if my first idea can't work.
> 
> On Tue, 21 Dec 2010 11:19:30 +0100, Martin Braun replied:
> >If your total bandwidth (sum of all bandwidths) does not exceed a couple
> >of MHz, you can use the polyphase channelizer (pfb_channelizer_ccf).
> >The result will be an equally spaced set of narrowband channels.
> 
> Why the "couple of MHz" limitation?  Is it because of the USRP, the USB 
> interface, the host computer, the polyphase channelizer, or some combination? 
>  In short, why can't the entire 6 MHz USRP bandwidth be channelized?
> 
> Thanks,
> 
> Rob
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