Joint spatial division and multiplexing: Realizing massive MIMO gains with limited channel state information
Joint spatial division and multiplexing: Realizing massive MIMO gains with limited channel state information
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DOI：
10.1109/ciss.2012.6310934
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发表时间：
2012-03
期刊：
影响因子：
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通讯作者：
Junyoung Nam;J. Ahn;Ansuman Adhikary;G. Caire
中科院分区：
文献类型：
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作者：
Junyoung Nam;J. Ahn;Ansuman Adhikary;G. Caire
我们提出了联合空间分割和复用(JSDM)，这是一种多用户MIMO下行链路的方法，它利用了信道向量相关性的结构，以允许大量的基站天线，同时需要相当少的用户的信道状态信息(CSI)反馈。由于降低了CSI要求，JSDM允许在FDD系统中使用大量基站天线。给出了相关信道模型，JSDM预编码的主要思想，以及JSDM预编码的设计，该预编码由仅基于信道协方差结构的预波束形成矩阵与基于降维变换后的信道的CSI的适当的多用户预编码串联而成。我们表明，在某些情况下，相对于具有全CSI的MIMO广播信道，JSDM不会导致最优性损失。
We propose Joint Spatial Division and Multiplexing (JSDM), an approach to multiuser MIMO downlink that exploits the structure of the channel vectors correlation in order to allow for a large number of base station antennas while requiring a considerably reduced channel state information (CSI) feedback from the users. Thanks to the reduced CSI requirement, JSDM allows the use of a large number of base station antennas also in FDD systems. This work presents the correlated channel model, the main idea of JSDM precoding, and the design of JSDM precoding, formed by the concatenation of a pre-beamforming matrix based only on the structure of the channel covariance, with suitable multiuser precoding based on the CSI of the reduced dimensional transformed channels. We show that in some cases JSDM incurs no loss of optimality with respect to the MIMO broadcast channel with full CSI.