How to measure LTE signal EVM

Ｈｉ　Ａｌｌ，
I use R&S instrument(SG and spectrum analyzer) to measure LTE-TDD EVM,(Center Freq: 2.6G, power: -30dBm)
But I am at a loss that I get the the value 87.18(EVM PDSCH 64QAM) , it beyond the limit 8.
I donot know how to make it, can anybody do me a favor?
And BTW, who can provide the remote commands for measure EVM, I want to use Labview to control it instead of manually.
Thanks a lot
Amanda

Hi Amanda,
Which specific Rohde & Scwarz instruments are you using? We have instrument drivers at ni.com/idnet for a number of devices, including some R&S SG's and analyzers. You can also download LabVIEW drivers at their website here. These should help you interface your instruments with LabVIEW. You should also make sure that you have NI-VISA installed on your machine. You can search for, download and install the appropriate version of this driver here.
Hope this helps!
Regards,
Stephanie R.
National Instruments
Stephanie R.
National Instruments

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