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Subject: |
Re: [Discuss-gnuradio] MIMO with USRP |
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Date: |
Tue, 29 Aug 2006 23:51:26 -0400 |
On Wed, 2006-08-30 at 11:06 +0800, hanwen wrote:
> I'm going to implement a 2 x 2 MIMO system with USRP and I came up
> with some problems of using USRP as sink and source.
> I'm using FLEX 2400. At the Tx side. I'm going to use two flex2400s
> with 1 TX/RX on each. At the Rx side, only one flex2400 is enough, I
> guess, because both TX/RX and RX2 can do receiving.
You can't receive both the Tx/Rx and Rx2 ports of a single RFX2400
simultaneously. You have to select one or the other with something
like:
u_src = usrp.source_c(decim_rate=rx_decim)
subdev = usrp.selected_subdev(u_src, (0,0)) # for side A
subdev.select_rx_antenna( 'TX/RX') # or 'RX2'
> The questions is how to make the two antenna at both Tx and Rx to work
> syncronously.
> If I instance two usrp_sink or source in one script, I'm afraid the
> two antennas may work independently.
> So in the .py script, how to set the usrp_sink and usrp_source and the
> mux value?
Sorry, I can't help with this part.
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