Changing the carrier signal of PSK

[nberkonat]

Hello,

I am currently working on the FMCW radar-communication signal transmission and reception. I am using Labview Communications 3 (also have 1) and NI USRP 2900. I need to use PSK modulation with the chirp signal as a carrier signal (my next step for the modulation will be reduced PSK). I checked the modulation examples PSK TX and RX which are already supplied as an example by NI but I could not find a way to change the carrier signal. If anybody can help me, I would appreciate! Thank you!

[YusufD_UK]

Hi,

Thanks for your post.

I had a few questions:

1. What is your project aim?

2. Please could you reiterate what you mean by "carrier signal"?

3. Are you trying to convert a raw signal into more meaningful data or is it a case of signal conditioning?

Cheers,

YD

[nberkonat]

Hi,

Thank you for your response. My aim is to make the PSK modulation on FMCW signal. Basically, I found the PSK TX and RX examples on Labview and I was trying to implement them on FMCW signal instead of a sine signal. Since I just started to learn Labview Communications, I could not design it from beginning.  

Thanks!

[YusufD_UK]

Hi,

Thanks for your reply. 

From what I have discussed with a few colleagues, this is quite difficult to do but these articles should give you a starting point.

Please see the "Downloads" section on the right-hand side.

RF Simulation Demo: IQ Data - National Instruments

The "IQ Data.vi" is quite useful.

You would need to understand I/Q data to understand how to change the frequency of your waveform, for a chirp signal

What is I/Q Data? - National Instruments

This is quite an in-depth example

Radar Tools Library 1.0 - Signal Generation - Discussion Forums - National Instruments

Hope these links help.

YD

[YusufD_UK]

The I/Q Data page will give you an understanding of how you can manipulate the phase and frequency and the radar tools library vi will show you how to do it.

[nberkonat]

Hi,

Thank you for your help! I am following the steps that you mentioned, but unfortunately I am using Labview Communications, and the IQ Data file is .vi. Is there any chance to find .gvi extention of the radar tools library?

Thank you!