How to set up two USRPs as a MIMO transmitter to transmit PRS modulated Sequences?

[sam2013ni]

Hi.

 I am trying to transmit two orthogonal sequences Using USRPs with Labview or GNU. The sequences have three levels (+1,-1 and 0). I was thinking using Partial Response Signaling method(similar to BPSK modulation) to modulate them. Is there any way of doing this?

Even if you can help me in transmitting a BPSK or QPSK modulated signal using two USRPs conencted with MIMO cable, it will be a huge favor. 

Thanks,

Sam.

[4Matted]

sam2013ni,

I do not believe we have an example that does exactly this. However in the USRP driver we have examples and I believe the modulation toolkit example "niUSRP Ex PSK TX.VI" would be an excellent starting point for your application. If you have downloaded niUSRP this will be in the niUSRP pallete>>examples>>modulation toolkit. Also there is a community example https://decibel.ni.com/content/docs/DOC-19209 that appears as though it may help you in getting started with your application. I believe these two resources can be put together to ultimately complete your task.

[sam2013ni]

Thanks alot Matt. 

I see what you are saying. I found an example in (http://www.ni.com/white-paper/13878/en/)  which implements MIMO 2x2. I was thinking of using the transmitters of this code for my application but this code uses just QAM modulation.  I am thinking of modifying this code. but before working on that may I ask if you are aware of any VI which I can use to transmit custom modulated I-Q data  (e.g. saved as txt files  in my computer)? I need two tranmitter to send exactly at the same time.

Thanks.

[4Matted · Accepted solution]

sam2013ni,

Here is a National Instruments KnowledgeBase article that discusses how to use the modulation toolkit with user defined data. Please try using this and see if this is helpful.

http://digital.ni.com/public.nsf/allkb/65790619262D402B86257260000C912D?OpenDocument