Re: [Discuss-gnuradio] USRP MIMO node bandwidth

[Eric Blossom]

On Mon, Jan 18, 2010 at 11:46:53PM +0100, Óscar González Fernández wrote:
> Dear all.
> 
> We are trying to setup a MIMO node using a USRP motherboard and two
> xcvr2450. Theoretically the maximum allowable transmission bandwidth when
> using two antennas simultaneously is 4 MHz or 8 MHz if using a single
> antenna (limited by the bandwidth of the USB port). However, we have seen
> that the maximum affordable aliasing free bandwidth is approximately 2 MHz
> due to the poor antialiasing performance of these filters. As we need more
> bandwidth, the question is: Do you think it could be possible to put a
> better interpolation filter that fits into the FPGA while mantaining two
> transmission and reception chains?

What is the amplitude of the signals you're sending?
If you need more linearity, try sending smaller signals.

Eric