Malone, David and Malone, Lesley A.
Ambient Radiofrequency Power: the Impact of the
Number of Devices in a Wi-Fi Network.
Health Physics, 96 (6).
This paper considers how the total radiofrequency power varies as the
number of devices in a Wi-Fi network increases. Under the assumption that
all devices in the network always have data to transmit, we show that work
from network engineering can be adapted to calculate the total transmitted
power, accounting for the possibility of multiple devices transmitting at the
same time. The paper focuses on total transmitted power as it gives an upper
bound on exposure and makes the impact of multiple devices clear. The results
show that the number of devices does have a significant impact on the radiated
power. For example, one station transmitting small packets in unicast mode
gives about half the nominal power value, to reach nominal value around 25
devices are required, and 150% of the nominal value is achieved around 350
devices. We see that 802.11's transmission protocol is usually effective in
limiting the power even in very large 802.11 networks.
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