  In this paper, a massive multiple-input-multiple-output (mMIMO) testbed that
is capable of mimicking realistic 5G new radio (NR) base station (BS)
beamforming performance has been utilised to gather experimental-based evidence
of 5G BS RF-EMF exposure within a real-world indoor environment. The mMIMO
testbed has up to 128 RF channels with user-programmable software defined radio
(SDR) capability. The stochastic nature of the 5G NR mMIMO system has been
statistically assessed by evaluating the spatial variation of the RF-EMF
exposure surrounding the mMIMO testbed when taking into account different beam
profiles and data rates. Several other factors that influence the RF-EMF of
mMIMO system have also being considered.
