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maybe i have not ubderstand the question.
Its a problem which says:
a source produce 8 symbols with the same probability , 5*10^4 symbols per second.
If the outputs efficiency is 0.75( from this i understand that i need 4 bits pes symbol) and bandwidth=50KHz, how would be a telecommunication system with 4-psk which would permit the transmission through channel with frequency response |C(f)=a|.