24.2 A 0.1-to-3.1GHz 4-element MIMO receiver array supporting analog/RF arbitrary spatial filtering
24.2 A 0.1-to-3.1GHz 4-element MIMO receiver array supporting analog/RF arbitrary spatial filtering
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24.2 支持模拟/射频任意空间滤波的 0.1 至 3.1GHz 4 元件 MIMO 接收器阵列
DOI：
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发表时间：
2017
期刊：
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通讯作者：
H. Krishnaswamy
中科院分区：
文献类型：
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作者：
Linxiao Zhang;H. Krishnaswamy
在每个元件处配备模数转换器（ADC）的数字接收机（RX）阵列使大规模多输入多输出（MIMO）应用成为可能，但由于在射频/模拟域中不存在空间干扰抑制，在强弱空间不同的带内信号共存的环境中，射频/模拟/ADC的动态范围受到挑战。近期的MIMO接收机阵列研究[1,2]试图通过在射频/模拟域进行（单个）空间陷波抑制来缓解这一问题，同时仍保持多个输出以支持MIMO。然而，可能存在不同功率水平的多个空间干扰信号，并且反射和散射会使空间域中的功率分布更具挑战性。在这种现实场景中，单个空间陷波是不够的。其次，陷波抑制带宽（BW）通常是有限的，就像传统的抵消架构一样。第三，依赖射频开关电容电路中的阻抗变换概念的可重构宽带MIMO接收机阵列在CMOS工艺中很少能在2GHz以上有效工作[1]。
Digital receiver (RX) arrays featuring ADCs at each element enable massive multi-in-multi-out (MIMO) applications, but since spatial interference rejection is absent in the RF/analog domain, RF/analog/ADC dynamic range is challenged in an environment where strong and weak spatially distinct in-band signals co-exist. Recent MIMO RX array works [1,2] attempt to mitigate this problem with (single) spatial notch suppression in the RF/analog domain, while still maintaining multiple outputs to support MIMO. However, multiple spatial interference signals at different power levels can be present, and reflections and scattering can make the power distribution in the spatial domain more hostile. A single spatial notch is insufficient in such realistic scenarios. Secondly, the notch suppression bandwidth (BW) is typically limited, as is the case with conventional cancellation architectures. Thirdly, reconfigurable wideband MIMO RX arrays that rely on impedance translation concepts in RF switched-capacitor circuits seldom operate effectively beyond 2GHz in CMOS [1].