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A multi-user MIMO channel is characterized by multiple degrees of freedom that can be alternatively exploited for increasing the link quality through diversity or improving the achievable data-rate through spatial multiplexing. A convenient trade-off between diversity and multiplexing gain is achieved by multi-user Orthogonal Space-Time Block Coding (OSTBC): an independent space-time code is employed on each user link, while multiple users are spatially multiplexed for additional capacity. This paper addresses the optimization of multi-user OSTBC systems where the receiver is provided with multiple antennas.
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