Can FPGA used to control powerline communications.

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i have a DE2 board which consist cyclone 2 ...can i use the board to test the likewise circuit..

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That would meet the requirement of 'any FPGA board'.

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Any idea how the circuit looks like if i want to replace the PIC....

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Look at the PIC circuit. Make sure you protect the FPGA I/O. Check that voltages are compatible. Add buffers where they are not. Simulate the analog circuit using LTSpice.

Try something out. If you use a buffer board between your DE2 and your test circuits, then the worst you can do is destroy the buffer board. Its time to roll up your sleeves and do something :)

Cheers,

Dave