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channel transfer vectors and MIMO - explanation needed

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leonidas790

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channel vectors

Hi

I have a problem.I will try and explain the problem. Assume there is just one antenna at the Tx and one at the Rx. In this case and assuming you know the Channel information of different users in an OFDMA cell under what circumstances would two different user signals be orthogonal? I have been reading about MIMO and it says that the dot product of the channel transfer vectors would be zero. Assuming there is no MIMO does this still hold? If it does hold is there a channel transfer vector when there is no MIMO present or just a single scalar??

Any help greatly appreciated
 

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