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MIMO systems employ multiple antennas at transmitter and receiver to improve the reliability and capacity of wireless links in a rich electromagnetic scattering environment. It is well known that the capacity of an (N,N) MIMO system increases with N, the number of antennas in the transmit and receive arrays on the assumption of independent Rayleigh fading between each pair of transmit and receive antennas. In practice, the independence of the received signals will depend on the angular distribution in the channel, the arrangement and radiation pattern of the antennas, and their polarization.
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