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IQ application to playback AM modulation

Hi everyone,


Specifications

  • LabView 2016
  • NI-USRP driver : 16.0


I'm trying to create a labview project to record and playback IQ data from AM modulation. 

First Step, I generate a AM signal through a generator with this settings : 

 

- Carrier frequency : 1 GHz
- AM freq : 2.500 kHz 

 

This signal is then received by an USRP-2954R through a coaxial cable.

Then In order to do the record, I decided to apply this settings:

- Number of samples : 1000
- IQ rate : 500k
- Carrier frequency : 1 GHz 

 

 

Record program

record_program.PNG



After this step, i created another program to playback my IQ data with these parameters:

- IQ rate : 500k

- Carrier frequency : 1 GHz

 

Playback program 
playback_program.PNG

 

Finally, I use a Spectrum analyzer to check the quality of my playback signal. Unfortunately, after many tests, I still can't get a clean signal 


Any suggestions would be most welcome.

 

Thanks!

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