Passband gfsk modulation in simulink

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Giuseppe B
Giuseppe B on 19 Sep 2012
Answered: charan on 27 Dec 2024
I have implemented a simple model which simulates a baseband GFSK modulation, using as data source a bernoulli random generator with sample time of 1/2000s and the block "CPM" with a Gaussian filter for the signal modulation. I've analyzed it with a spectrum scope and it works pretty well at baseband.
Now I want to bring the signal at an higher frequency (~100Mhz), how to do it? I tried to multiply it by a carrier (sample time equal to the one used for the baseband signal), but the modulated signal seems that cannot go further than 900Khz. Why? Where I'm wrong?
Thank you. Giuseppe B.
  5 Comments
Emmanuel
Emmanuel on 18 Feb 2023
Hello @Jason Chang, could you create GFSK clock in simulink? i need de answer

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Answers (1)

charan
charan on 27 Dec 2024
Hello,
Passband GFSK modulation can be performed in Simulink using the "CPM Modulator Baseband" block in Simulink. This can be done by setting the "M-ary number" parameter of the block to "2", "Input type" to "bit" and "Frequency pulse shape" to "Gaussian".
The following example provides more information about the same:
In this example, the Bluetooth radio module uses GFSK, which represents a binary 1 as a positive frequency deviation and a binary 0 as a negative frequency deviation. This is implemented using the "CPM Modulator Baseband" block.
You can refer to the below links on CPM Modulator and Demodulator blocks:

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