论文标题
从大型MIMO 5G测试床上对射频电磁场暴露的评估
An Assessment of the Radio Frequency Electromagnetic Field Exposure from A Massive MIMO 5G Testbed
论文作者
论文摘要
当前的射频电磁场（RF-EMF）暴露极限已成为第五代移动网络部署的关键问题。法规不统一，在某些国家和地区，它超出了国际非电离辐射保护委员会（ICNIRP）规定的准则。使用大量的多输入 - 型号输出（MMIMO）测试床具有光束成型功能，能够模仿现实的5G基站（BS）性能，本文对其在现实世界中室内环境中相关的RF-EMF暴露进行了实验和统计评估。 MMIMO TestBed具有多达128个通道，具有用户可编程的软件定义无线电（SDR）功能。对于相关的用户终端天线设置和位置，它可以在通道状态信息（CSI）获取后进行零效预码（CSI）采集。使用64个主动MMIMO传输天线，在不同位置的单用户（SU）和多用户（MU）下行链路通信已经考虑了8个波束形成场景。使用校准的三轴各向同性现场探针，获取了每个光束成型场景的接收通道功率热图，然后转换为RF-EMF热图。根据光束配置文件和用户数的变化评估了相关的RF-EMF统计信息。
Current radiofrequency electromagnetic field (RF-EMF) exposure limits have become a critical concern for fifth-generation (5G) mobile network deployment. Regulation is not harmonized and in certain countries and regions it goes beyond the guidelines set out by the International Commission on Non-Ionizing Radiation Protection (ICNIRP). Using a massive multiple-input-multiple-output (mMIMO) testbed with beamforming capabilities that is capable of mimicking realistic 5G base station (BS) performance, this paper presents an experimental and statistical assessment of its associated RF-EMF exposure within a real-world indoor environment. The mMIMO testbed has up to 128 channels with user-programmable software defined radio (SDR) capability. It could perform zero-forcing precoding after channel state information (CSI) acquisition for different beamforming scenarios with respect to the associated user terminal antenna setups and positions. With 64 active mMIMO transmit antennas, 8 beamforming scenarios have been considered for single-user (SU) and multi-user (MU) downlink communications at different locations. Using a calibrated triaxial isotropic field-probe, the received channel power heat map for each beamforming scenario was acquired and then converted into an RF-EMF heat map. The relevant RF-EMF statistics was evaluated based on the variations of beam profiles and number of users.
