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I have modelled an acoustic modem in simulink, i have used the CRC-4 (STD-ITU) scheme to protect the data for transmission, On the receiver end, the CRC decoder detects the errors in the received frames. I would like to send a request to the transmitter to retransmit this error frame, I am stuck at this part, Any help regarding this would be greatly appreciated.

Simulink Modem

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