Implement MIMO in the 802.11 application framework

[HDCAI]

To implement MIMO, I first reconfigured the RF in the framework. amend as below:
Host Part

I modified the three modules（802.11 Configure TX RF、802.11 Configure RX RF、802.11 Configure RX Streams） in the figure to enable tx0.stream, tx1.stream, rx0.stream, rx1.stream.

The part of the red line is modified.

FPGA Part

I modified 802.11 USRP Stream TX.gvi and 802.11 USRP Stream RX.gvi to allow signals to be transmitted over four streams.

Result

The results were not satisfactory, but they could not be said to be unsuccessful. In fact, sometimes the results of the program run are consistent with what I expected. But most of the time the receiver does not show the correct result. These indicate that the program is not stable. So I did the following experiment.

I only modified the 802.11 Configure RF Streams.gvi in the framework.This change makes tx0.stream, tx1.stream, rx0.stream, rx1.stream all true.At this time the receiver is not working properly.This result makes me very confused. And the frustrating thing is that I can't see the problem. I would be grateful if anyone could point out my problem or give another solution.

Before modificationAfter modification

Running Program

[carmen9]

Is your implementation based on the MIMO Application Framework? (Manual Link)

Here are some manuals which could help you: 

LabVIEW Communications 802.11 Application Framework 3.0 Getting Started Guide

MIMO Prototyping System

[HDCAI]

I don't know about the MIMO Application Framework.But I will take a look at it.Thanks for your help.

[carmen9 · Accepted solution]

Here is a white paper on this topic:  http://www.ni.com/zh-cn/innovations/white-papers/16/mimo-application-framework-white-paper.html

and a MIMO Application Framework download link: http://www.ni.com/download/mimo-application-framework-2.0/7980/en/

[HDCAI]

Now I found the problem is that when I make both rx0.stream and rx1.stream true, the receiver does not display.So I think the problem is in the DDC (Multi-Channel).gvi of the 802.11 USRP Stream RX.gvi module.However, I am not paying attention to this issue now. And not paying attention to MIMO. My implementation bypasses DDC (Multi-Channel).gvi.

[carmen9]

Hi hdcai,

You can post your implementation here for future reference. It would be a great help to other users! 

[awpep]

hello，did you work this out？I'm doing the same thing recently，but none of the modifications succeeded. I really appreciated if you could help me! Thank  you!