From Single User to Multiuser Communications : Shifting the MIMO Paradigm
From Single User to Multiuser Communications : Shifting the MIMO Paradigm
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发表时间：
2007
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通讯作者：
D. Gesbert;M. Kountouris;R. Heath;C. Chae;T. Sälzer
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作者：
D. Gesbert;M. Kountouris;R. Heath;C. Chae;T. Sälzer
在多用户MIMO网络中，通过调度多个用户同时共享空间信道，B可以有利地利用由多个天线提供的空间自由度来增强系统容量。这需要从单用户通信的基本范式转变，因为多用户系统可以从发射机处的信道状态信息中获得实质性的益处，并且同时需要更复杂的调度策略和收发机方法。本文从算法的角度回顾了多用户MIMO通信，讨论了性能增益、权衡和实际考虑。综述了包括非线性和线性信道感知预编码的几种方法，沿着了更实用的有限反馈方案，这些方案只需要部分信道状态信息。讨论了预编码和调度之间的相互影响。有限多用户反馈设计的几个有前途的策略，其中一些是从单用户MIMO预编码的情况下，而其他人是完全特定于多用户设置的启发。
In multiuser MIMO networks, the spatial degrees of freedom o ffered by multiple antennas can be advantageously exploited to enhance the system capacity, b y scheduling multiple users to simultaneously share the spatial channel. This entails a fundamental parad igm shift from single user communications, since multiuser systems can experience substantial benefit from channel state information at the transmitter and, at the same time, require more complex scheduling st rategies and transceiver methodologies. This paper reviews multiuser MIMO communication from an algorit hmic perspective, discussing performance gains, tradeoffs, and practical considerations. Several a pproaches including non-linear and linear channelaware precoding are reviewed, along with more practical lim ited feedback schemes that require only partial channel state information. The interaction betwee n precoding and scheduling is discussed. Several promising strategies for limited multiuser feedback desig n are looked at, some of which are inspired from the single user MIMO precoding scenario while others ar e fully specific to the multiuser setting.