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Problem with Costas Loop Implementation

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semion_z

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I have designed the QPSK transmitter and receiver system in Simulink based on the costas loop implementation.
The data rate is 1 MHz.
Carrier frequency is 5 MHz.
Without any frequency shift the system works well but when I introduce even a small shift, the costas loop is not able to track the signal.
Please help me to find the problem in the design (it is attached).
Thanks in advance.
 

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