Spatial Transmission Mode Switching in Multiuser MIMO-OFDM Systems With User Fairness
Spatial Transmission Mode Switching in Multiuser MIMO-OFDM Systems With User Fairness
复制标题
具有用户公平性的多用户 MIMO-OFDM 系统中的空间传输模式切换
DOI：
10.1109/tvt.2009.2029551
复制
发表时间：
2010
影响因子：
6.8
通讯作者：
V. Jungnickel
中科院分区：
文献类型：
--
作者：
M. Schellmann;L. Thiele;T. Haustein;V. Jungnickel
多天线无线电系统允许以分集或空间复用（SMUX）模式接入信道。根据当前信道条件在这些模式之间进行适当的切换，可以显着提高性能，同时几乎不需要来自接收端的反馈。我们提出了一种传输概念的多用户多输入多输出正交频分复用（MU-MIMO-OFDM）系统的下行链路，旨在高用户速率与有限的反馈需求。一个扩展的基于分数的调度（SB）的方法，确保公平的资源分配给用户，而传输模式切换是用来保证高用户速率。调度器的公平程度可以通过适当地配置用于分数的加权函数来适配。与单模方案的比较显示了大量的吞吐量增益的自适应切换的概念。此外，针对最大吞吐量，我们表明，相当大比例的MIMO广播信道（BC）的容量可以实现相对较低的量所需的反馈。
Multiantenna radio systems allow accessing the channel in diversity or spatial multiplexing (SMUX) mode. Adequate switching between these modes according to current channel conditions was shown to yield significant performance improvements while requiring little feedback from the receiving side. We present a transmission concept for the downlink of a multiuser multiple-input-multiple-output orthogonal frequency-division-multiplexing (MU-MIMO-OFDM) system aiming at high user rates with limited feedback demands. An extended score-based scheduling (SB) approach ensures fair-resource allocation to the users, whereas transmission mode switching is used to guarantee high user rates. The degree of fairness of the scheduler can be adapted by adequately configuring a weighting function for the scores. Comparison with single-mode schemes reveals substantial throughput gains of the adaptive switching concept. Furthermore, targeting maximum throughput, we show that a considerable proportion of the capacity of the MIMO broadcast channel (BC) can be achieved with a comparatively low amount of required feedback.