continouse OFDM with filtering

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Diana
Diana 2017-1-9
I'm trying to do the following code data (bits) QAM-MApping using (comm.RectangularQAMModulator) IFFT( to generate the OFDM symbol) then I do pulse shaping (using conv) then I add a constant value(+c) Afterwards to detect the signal I remove the constant value (-c) conv FFt QAM demapping (using comm.RectangularQAMDemodulator)
The problem is that after the QAM demapping I receive an error. If i didn't add the constant value the problem is solved .. can any one please tell me how can I solve the problem. Thanks

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