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Re: [Discuss-gnuradio] hi all, can I use one RX receive a wideband signa

From: Walker, Robert CIV NWDC, Science Advisor
Subject: Re: [Discuss-gnuradio] hi all, can I use one RX receive a wideband signal and then seperate it to many narrowband signals
Date: Tue, 21 Dec 2010 14:10:13 -0500

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?



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