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arXiv 2008.04345eess.SPcs.SYeess.SY
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大规模多输入多输出5G测试床的射频电磁场暴露评估

An Assessment of the Radio Frequency Electromagnetic Field Exposure from A Massive MIMO 5G Testbed

Tian Hong Loh, Fabien Heliot, David Cheadle, Tom Fielder

摘要:

当前射频电磁场(RF-EMF)暴露限值已成为第五代(5G)移动网络部署的关键问题。监管不统一,在某些国家和地区,监管超出了国际非电离辐射防护委员会(ICNIRP)制定的准则。本文使用具有波束成形功能的大规模多输入多输出(mMIMO)测试平台,能够模拟真实的5G基站(BS)性能,对其在真实室内环境中的相关RF-EMF暴露进行实验和统计评估。mMIMO测试平台具有多达128个通道,具有用户可编程软件定义无线电(SDR)功能。它可以在信道状态信息(CSI)获取之后针对关于相关联的用户终端天线设置和位置的不同波束成形场景执行迫零预编码。利用64个活动mMIMO发射天线,针对不同位置处的单用户(SU)和多用户(MU)下行链路通信考虑了8种波束成形场景。使用校准的三轴各向同性场探头,获取每个波束成形场景的接收通道功率热图,然后将其转换为RF-EMF热图。基于波束剖面和用户数量的变化,评估了相关的RF-EMF统计数据。

英文摘要:

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.

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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