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Question about OFDM MIMO system channel definition

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Mellon

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I am going to simulate a LTE OFDM-MIMO system using matlab, now, I need to define a channel, in case if I have 'n' transmit antenna, and 'm' receive antenna, the channel matrix 'h' should be a m*n matrix, my question is how to define this m*n matrix 'h', what kind of value I can select for the matrix element, Can anybody give a example of the channel matrix definition? thanks?

(PS, somebody told me, the channel matrix must satisfy h*conj(h)=1, why??)
 

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