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The initial MU-MIMO technique has been submitted to solve the fundamental problems of multi-antenna diversity technique in cellular networks when use for packet scheduling systems. It has been proved that the Alamouti technique can degrade the performance of high speed packet access sytems because it can smoothing the peak of the user channel. We discuss the brief history of multiuser MIMO systems in the following sections based on the above motivation.

TxD with HSDPA

TxAA for multiuser transmission

PU2RC for MIMO

Dynamic PU2RC

  • Delta

PU2RC (Evolutionary) vs. ZFBF (Revolutionary)

Modified-PU2RC

Semi-unitary

Rotated-PU2RC

PU2RC + ZFBF

PU2RC-CQI for ZFBF

PU2RC for Relay Networks

Beyond PU2RC

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