[Discuss-gnuradio] MIMO Status

[Justin Bracken]

Hello All,

 

As I have stated in the past Im interested in VNA style measurements. Specifically S21. From what I have read and found out experimentally I need two coherent recievers to do this. And thus I need MIMO or something MIMO like.

 

The wiki provides the following information (http://gnuradio.org/redmine/wiki/1/USRP2GenFAQ#What-are-the-different-ways-MIMO-can-be-set-up-with-more-than-one-USRP2). These methods are in development according to it with a time hack of (14 November 2008). Thus they are not available is what I understand from the wiki. Any updates?

 

Scenario 1 - Two USRP2 systems connected by a MIMO cable:

Scenario 2 - Up to Four USRP2 systems connected by MIMO cables to the not-yet-in-existence HUB:

Scenario 3 - An arbitrary number of USRP2 systems, no MIMO cables, no HUB:

 

Now it looks like MIMO is available or Scenario 1. But it requires the UHD driver and an updated GRC version. Is this correct? How do I differentiate between whether I have this functionality or not? Is there a way to query the USRP and find this? I didn't build GRC myself. I have v3.3.1git-47-gf6337c62. Is this the right version?

 

Thanks,

Justin.