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digital FM modulation using VCO and implementing limiter

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sanam86

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Hi all,
I want to implement a simple communication system with digital FM using VCO, but Igot confused about using VCO for modulation in matlab!
Also, after modulation there are limiter and discriminator blocks, is it necessary to use demodulation matlab function in this system?
Finally, for this simple system, can I use simple amplitude limiter or a lowpass filter?
The system diagram is attached here,
Thanks.
 

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