Outdoor MIMO wireless channels: models and performance prediction
Outdoor MIMO wireless channels: models and performance prediction
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DOI：
10.1109/tcomm.2002.806555
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发表时间：
2002-12
期刊：
影响因子：
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通讯作者：
D. Gesbert;H. Bölcskei;D. Gore;A. Paulraj
中科院分区：
文献类型：
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作者：
D. Gesbert;H. Bölcskei;D. Gore;A. Paulraj
我们提出了一种新的多输入多输出（MIMO）室外无线衰落信道模型及其容量性能。所提出的模型比通常的独立同分布（i.i.d.）模型更加通用和现实，并且允许我们研究信道容量的行为，作为发射机和接收机的散射半径、发射和接收阵列之间的距离以及天线波束宽度和间距的函数。我们通过特定的传播参数集展示了空间衰落相关性和信道矩阵的条件数如何控制 MIMO 容量。所提出的模型解释了“针孔”通道的存在，该通道在链路两端表现出低空间衰落相关性，但仍然具有较差的等级特性，因此遍历容量较低。事实上，该模型表明存在一个更通用的通道系列，从全秩 i.i.d. 连续跨越。到低等级针孔情况。我们提出了预测 MIMO 信道中高秩（以及因此高遍历容量）的指南，并表明即使在长距离内，在温和散射条件下也可以轻松维持高信道秩。最后，我们通过使用光线追踪技术进行模拟来验证我们的结果。与基本天线理论建立了联系。
We present a new model for multiple-input-multiple-output (MIMO) outdoor wireless fading channels and their capacity performance. The proposed model is more general and realistic than the usual independent and identically distributed (i.i.d.) model, and allows us to investigate the behavior of channel capacity as a function of the scattering radii at transmitter and receiver, distance between the transmit and receive arrays, and antenna beamwidths and spacing. We show how the MIMO capacity is governed by spatial fading correlation and the condition number of the channel matrix through specific sets of propagation parameters. The proposed model explains the existence of "pinhole" channels which exhibit low spatial fading correlation at both ends of the link but still have poor rank properties, and hence, low ergodic capacity. In fact, the model suggests the existence of a more general family of channels spanning continuously from full rank i.i.d. to low-rank pinhole cases. We suggest guidelines for predicting high rank (and hence, high ergodic capacity) in MIMO channels, and show that even at long ranges, high channel rank can easily be sustained under mild scattering conditions. Finally, we validate our results by simulations using ray tracing techniques. Connections with basic antenna theory are made.