Re: hi all, can I use one RX receive a wideband signal and then seperate it to many narrowband signa

GNU Radio
1

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 B. 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

2

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