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'''Per-user unitary rate control''' ('''PU<sup>2</sup>RC''') is a multi-user [[MIMO]] (multiple-input and multiple-output) scheme. PU<sup>2</sup>RC uses both transmission pre-coding and multi-user scheduling. By doing that, the network capacity is further enhanced than the capacity of the single-user MIMO scheme.
* Background technologies: A single-user MIMO was initially developed to improve the spectral efficiency of point-to-point wireless transmission link. A multi-user MIMO was developed for cellular systems where the base station simultaneously communicates with multiple users.
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