Introduce correlation into wireless fading channel

Hi experts

I need to simulate wireless MIMO fading channel in both Gaussian and Rayleigh random variables. I have implemented the channel matrix

H = h11 h12
h21 h22

where h11 h12 h21 h22 are independent Gaussian or Rayleigh random variables. Could somebody teach me how to introduce correlations among thoese random variables in terms of correlation coefficient?

Thanks for any helps.
regards,

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