Rotated QPSK over Rayleigh Fading channel implemented by Alamouti coding

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I'm not talking about simple QPSK scheme over Rayleigh channel.. The signal constellation has to be rotated by some angle say, pi/4 or pi/8. Then it has to be communicated over Rayleigh slow fading channel, at the presence of Gaussian noise. Alamouti STBC will have to be there to perform over the channel, but its mode of data encoding has to be the rotated QPSK, rather than normal BPSK.
Can anyone please help me with this??

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