Enhancing Capacity in Compact MIMO-OFDM Systems With Frequency-Selective Matching
Enhancing Capacity in Compact MIMO-OFDM Systems With Frequency-Selective Matching
复制标题
通过频率选择性匹配增强紧凑型 MIMO-OFDM 系统的容量
DOI：
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复制
发表时间：
2017
影响因子：
8.3
通讯作者：
B. Hughes
中科院分区：
文献类型：
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作者：
Lopamudra Kundu;B. Hughes
在多输入多输出（MIMO）系统中，接收天线之间的互耦会严重降低系统的容量。先前的工作表明，这些损失往往可以显着减少使用复杂的天线匹配在接收机。然而，以前的研究只集中在频率非选择性匹配，并依赖于仅对小带宽有效的假设。在本文中，我们考虑了宽带MIMO-OFDM系统的容量与耦合接收天线。我们提出了上界和下界的最佳容量，可以通过物理实现，频率选择性天线匹配。对于示例中考虑的大多数天线配置，上界和下界一致，从而确定容量最佳匹配的性能。这些结果表明，频率选择性匹配可以显着增加容量的存在下，强耦合。此外，这些增益可以通过一类简单的匹配网络来实现，这些网络很容易在硬件中实现。
Mutual coupling among receive antennas can profoundly reduce capacity in multiple-input, multiple-output (MIMO) systems. Prior work has shown that these losses can often be significantly reduced by using sophisticated antenna matching at the receiver. However, previous studies have focused exclusively on frequency non-selective matching, and rely on assumptions that are valid only for small bandwidths. In this paper, we consider the capacity of broadband MIMO-OFDM systems with coupled receive antennas. We present upper and lower bounds on the best capacity that can be achieved by physically realizable, frequency-selective antenna matching. The upper and lower bounds coincide for most antenna configurations considered in the examples, and thus determine the performance of capacity-optimal matching. These results suggest that frequency-selective matching can significantly increase capacity in the presence of strong coupling. Moreover, these gains can be achieved by a simple class of matching networks that are easily realized in hardware.