single FPGA as TXR and RXR

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Hello,

I have just been exposed to working with FPGA. I want a single FPGA to act as the transmitter(say, generates bits) and as a Receiver(say, to test for bit error) . How do I make the fpga to run both the programs simultaneously? And what are the factors that I should keep in mind while trying to get the output right?

Thanks in advance !

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you haven't been told what comms system you are targeting FSK, QPSK other QAMs...etc? That is most crucial information for you