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Unsatisfactory output of 16 QAM transmitter with RRC filter

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Krishnakumar
Krishnakumar 2013-9-22
I am simulating 16 QAM transmitter(data rate : 128 Kbps) with RRC filter(Root Raised Cosine).My filtered output is not obtained as desired. My model and FDA tool interface are attached. My requirement is to get a good frequency response and constellation. Filter specs I gave are:
Filter order :128
Window :Chebyshev (120 dB stop band attn)
Sampling frequency : 128KHz (modulated data was up sampled 4 times)
Cut off :15.15KHz
I am confused about cut off as I found it is 1/2Ts in many textbooks. Please help me by hinting about discrepancies in my simulation.

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