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Spatial multiplexing is required to configure MIMO antenna. Spatial multiplexing require a high data rate to split into multiple lower data rate stream is transmitted from different transmit antenna in the same frequency channel. If these signals arrive at the receiver antenna array with sufficiently different spatial signature, the receiver can separate these streams, creating parallel channel free. Spatial multiplexing is very powerful technique for increasing channel capacity at higher SNR. The maximum number of spatial stream is limited by lesser number of antennas at the transmitter and receiver. To implement spatial multiplexing in MIMO based mobile ad-hoc network the authors can achieve up to eight times higher data rates compare to selecting only one user pair at a time.
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