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

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Document pages: 5 pages

Abstract: Current radiofrequency electromagnetic field (RF-EMF) exposure limits havebecome a critical concern for fifth-generation (5G) mobile network deployment.Regulation is not harmonized and in certain countries and regions it goesbeyond the guidelines set out by the International Commission on Non-IonizingRadiation Protection (ICNIRP). Using a massive multiple-input-multiple-output(mMIMO) testbed with beamforming capabilities that is capable of mimickingrealistic 5G base station (BS) performance, this paper presents an experimentaland statistical assessment of its associated RF-EMF exposure within areal-world indoor environment. The mMIMO testbed has up to 128 channels withuser-programmable software defined radio (SDR) capability. It could performzero-forcing precoding after channel state information (CSI) acquisition fordifferent beamforming scenarios with respect to the associated user terminalantenna setups and positions. With 64 active mMIMO transmit antennas, 8beamforming scenarios have been considered for single-user (SU) and multi-user(MU) downlink communications at different locations. Using a calibratedtriaxial isotropic field-probe, the received channel power heat map for eachbeamforming scenario was acquired and then converted into an RF-EMF heat map.The relevant RF-EMF statistics was evaluated based on the variations of beamprofiles and number of users.

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