Issuer of OFDM using RFSG

Hello everyone, I am a newbie in LabVIEW and I try to convey this OFDM vi, I received document to ErikL (https://decibel.ni.com/content/docs/DOC-34781). But I got an error trying to connect this vi to block sender RFSG (wire outside after rfsg Resample errors and writing block). The rate of default established IQ 5 M with 1250 input bits. This is the explanation of the error:

Error 1 has occurred in rfsg_Determine settings for .vi Resampling (entries OK)

Possible reasons:
The waveform sample rate must be greater than 1.

I build using Labview 2015 and SMU 5646R.

Can anyone help me please with this problem? Any sample or the answer would be very useful.

Hi Vince,.

A couple of things I noticed by looking in the TX.vi of OFDM. The first thing, the error you see is because the dt is used as the sampling frequency in the Subvi that returns this error. If you turn the highlight performance and follow the error code in the subvis you can see this for yourself. As I looked through the code I noticed a few places where the dt rates and sample were be interchanged. The first place, that this error occurs is the highest level VI (OFDM, TX.vi). If you follow the IQ rate control which is at the top of the loop, you will see that it is connected to the dt of the waveform without reciprocal to translate between the two.

The second thing to note is how you handle the embedded while loops in the lop level VI (OFDM, TX.vi). There are two distinct stop buttons, a loop for each. What makes such as, according to the State of enforcement and stop, button you press, the program can not stopped correctly, which means that you can use the button abandon, which should be avoided. The following link details how to stop shipped while loops:

http://digital.NI.com/public.nsf/allkb/D75CE81B7594D7918625694B005376EA

Another little architectural thing to notice, this is how the "witness" is written to a variable, and the real indicator inside while loop on the right in the TX.vi of the OFDM. The two GenerThis creates a race condition. Here is a help page which details the local variables and the race conditions:

http://zone.NI.com/reference/en-XX/help/371361H-01/lvconcepts/using_local_and_global/

It seems that you have a very good start to the implementation of OFDM with RFSG. I hope that the suggestions above will point you in the right direction.

Kind regards

Jayk

Tags: NI Hardware

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