06-02-2015 09:04 PM - edited 06-02-2015 09:07 PM
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.
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06-03-2015 09:19 AM
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.
06-11-2015 09:58 PM
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.
06-12-2015 11:03 AM
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