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In this paper a 3D channel model for wireless communication is studied. Also this paper enlightens the difficulties of the analysis of 3D channel model as there are several geometric parameters are required to perform the analytical correlations and to see how the channel depends on those parameters. The reason for preferring MIMO systems which is based on information theory point of view is that it takes no extra cost concerning transmit power or bandwidth The advantage of MIMO systems is that, it provides high gain, high directivity, space and multi user diversity gain, spatial multiplexing gain, array and coding gain and interference reduction.
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