I have 2 USRP-2922. I want to make 2x2 MIMO system design but when I look some works done in MIMO for instance 8x8, 4x4,6x6 it seemingly not possible.Is it true or false?
I'm not exactly sure what you're asking, but if it's can you do 2x2 MIMO with 2922's, then absolutely yes. Here's a white paper that's specifically geared at 2x2 MIMO: http://www.ni.com/white-paper/13878/en/
Sounds like you might have already seen this one, but this paper also goes into the theory: http://www.ni.com/white-paper/14311/en/. It's specific example is an 8x8 system but the principles would all apply to 2x2 as well.
NI Applications Engr.
I want to make 2x2 MIMO by using 2 USRP-2922.I think it is not possible because 8x8 MIMO system design paper use 16 USRP-2920 kit. Indeed when I tried to first example in the white paper, front panel of the Tx and Rx part need 2 usrp separetely.
Actually I have two USRP 2922. When I connect two USRP by using MIMO expansion cable, I have 2 Tx and 2 Rx