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Ambient Radiofrequency Power: the Impact of the Number of Devices in a Wi-Fi Network

Malone, David and Malone, Lesley A. (2009) Ambient Radiofrequency Power: the Impact of the Number of Devices in a Wi-Fi Network. Health Physics, 96 (6). pp. 629-635. ISSN 0017-9078

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Abstract

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 signi ficant 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 e ffective in limiting the power even in very large 802.11 networks.

Item Type: Article
Additional Information: This is a non- final version of the article published in final form in Health Physics. Vol 96, Issue 6, 629-635, June 2009. See http: //www.health-physics.com/
Keywords: exposure; radiofrequency; dose assessment; safety standards; computers;
Subjects: Science & Engineering > Hamilton Institute
Item ID: 2643
Identification Number: doi: 10.1097/01.HP.0000341329.79077.29
Depositing User: Hamilton Editor
Date Deposited: 13 Oct 2011 14:17
Journal or Publication Title: Health Physics
Publisher: Lippincott, Williams & Wilkins
Refereed: No
URI:

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