Rotated QPSK over Rayleigh Fading channel implemented by Alamouti coding

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??

Answer 1

[Amit Kansal]

Please review the example:

https://www.mathworks.com/help/releases/R2026a/comm/usrpradio/ug/alamouti-coding-based-mimo-transmitter-using-usrp-radio.html

and the code.

This uses QPSK modulation followed by Alamouti encoding. The rotation can be applied to the QPSK modulation prior to Alamouti encoding.

There is also an accompanying receiver example you can refer to that is linked from the above exmaple.