Hi,
Are you also using our RF hardware? If you are, all of our modulation is done in software (analog and digital), so you could essentially write your own modulation schemes in software. This would definitely be much easier and would save you a lot of programming.
In fact we already have an example online that would do this for you.
This example does require the modulation toolkit.
Without the modulation toolkit, you would be receiving the I and the Q data in complex form. You would then have to implement the modulation in software.
Hope this helps.
Regards,
Raajit L
National Instruments