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arXiv 1612.04775cs.ITmath.IT
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在非授权频带中操作大规模MIMO以增强共存和空间重用

Operating Massive MIMO in Unlicensed Bands for Enhanced Coexistence and Spatial Reuse

Giovanni Geraci, Adrian Garcia-Rodriguez, David López-Pérez, Andrea Bonfante, Lorenzo Galati Giordano, Holger Claussen

摘要:

我们建议在未经许可的频段中运营大规模多输入多输出(MIMO)蜂窝基站(BS)。我们将这样的系统表示为大规模MIMO未授权(mMIMO-U)。我们设计了蜂窝基站所需的关键程序,以保证与附近的Wi-Fi设备在同一频段内共存。具体地,通过主动抑制对相邻Wi-Fi设备的干扰来增强空间重用。Wi-Fi干扰抑制也在增强的先说后听(LBT)阶段期间执行。这些操作使得Wi-Fi设备能够接入信道,就好像没有蜂窝BS在进行传输一样,反之亦然。在同时进行Wi-Fi和BS传输的情况下,蜂窝用户设备(UE)可达到的下行链路速率由于Wi-Fi生成的干扰而降级。为了减轻这种影响,我们考虑Wi-Fi/UE邻近度的测量,选择要在未授权频带中服务的UE的合适集合。我们的研究结果表明,这样设计的mMIMO-U允许同时蜂窝和Wi-Fi传输,保持他们的相互干扰低于监管阈值。与没有干扰抑制的系统相比,Wi-Fi设备在16个天线和128个天线的情况下,平均干扰功率降低了3 dB和18 dB。利用mMIMO-U,蜂窝BS还可以实现大的数据率,而不会显著降低部署在其覆盖区域内的Wi-Fi网络的性能。

英文摘要:

We propose to operate massive multiple-input multiple output (MIMO) cellular base stations (BSs) in unlicensed bands. We denote such system as massive MIMO unlicensed (mMIMO-U). We design the key procedures required at a cellular BS to guarantee coexistence with nearby Wi-Fi devices operating in the same band. In particular, spatial reuse is enhanced by actively suppressing interference towards neighboring Wi-Fi devices. Wi-Fi interference rejection is also performed during an enhanced listen-before-talk (LBT) phase. These operations enable Wi-Fi devices to access the channel as though no cellular BSs were transmitting, and vice versa. Under concurrent Wi-Fi and BS transmissions, the downlink rates attainable by cellular user equipment (UEs) are degraded by the Wi-Fi-generated interference. To mitigate this effect, we select a suitable set of UEs to be served in the unlicensed band accounting for a measure of the Wi-Fi/UE proximity. Our results show that the so-designed mMIMO-U allows simultaneous cellular and Wi-Fi transmissions by keeping their mutual interference below the regulatory threshold. Compared to a system without interference suppression, Wi-Fi devices enjoy a median interference power reduction of between 3 dB with 16 antennas and 18 dB with 128 antennas. With mMIMO-U, cellular BSs can also achieve large data rates without significantly degrading the performance of Wi-Fi networks deployed within their coverage area.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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