OFDM MIMO 4x4 with NI USRP 2920

[Patricioa1]

Implementing MIMO 2x2 based on the link: https://forums.ni.com/t5/Software-Defined-Radio/6x6-MIMO-OFDM-System-with-NI-USRP-and-LabVIEW-Commun...  program works with the default parameters but when implementing a MIMO 4x4 system does not work, it only receives me noise. Someone who can help me please.

[evlachos]

Hello, I have just managed to get it work with for the case of 2x2 MIMO! Try to do the following changes:

1) specify the 2 ips of the TX and RX and deselect the remaining ones

2) IQ rate =0.5M

3) I used 4.4G as the carrier frequency

4) nofdm_symbols=16

5) sequence_len=8 and Nt=Nr=2 and set the custom params (at the OFDM params control)

6) the the timestamp to now

Hope it helps!

Evangelos

[Patricioa1]

Hello,
I would like to know the parameters for 4x4 MIMO  to work. Could you help me with this?

[evlachos]

Hello,

In particular I have a system design like the the following one:

 

I am sending you the screenshots of the TX/RX front panels

and also my custom global parameters:

[Patricioa1]

Thanks you so much

Thank you so much
But I do not work  4x4 MIMO  with those parameters maybe you have some idea that I can change to make 4x4 MIMO work.
Please.