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Per-User Unitary Rate Control (PU2RC) is a multi-user MIMO scheme. PU2RC utilizes 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. * Principle: The concept of Per-User Unitary Rate Control (PU2RC) was proposed in (US Patent No. 7,324,480, ''Mobile communication apparatus and method including base station and mobile station having multi-antenna'' ) by James S. Kim, Kwang Bok Lee, Kiho Kim and Changsoon Park. Recently, PU2RC has been adopted in the IEEE 802.16m system description documentation (SDD) and the concept of this scheme was included in 3GPP LTE standard. ==Technology== Per-User Unitary Rate Control (PU2RC) is a practical multi-user MIMO solution. PU2RC allows a base station to transmit different data streams to multiple users simultaneously. The base station selects target users from candidate users based on the information fed by users. Transmission data are multiplied by a pre-coding matrix selected from the set of predefined matrices before transmission. The selection of a pre-coding matrix is determined based on the information provided by users. The selection of both target users and a pre-coding matrix according to the information provided by mobiles enables the utilization of multi-user diversity and data multiplexing at the same time. Moreover. Using predefined precoding matrices reduces feedback overhead from users to the base station. Pre-coding matrices used in this scheme is unitary. The use of unitary pre-coding matrices facilitates the estimation of interference from other users’ data to the unintended user. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Per-User Unitary Rate Control」の詳細全文を読む スポンサード リンク
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