Measurement and Comparison of Wi-Fi and Super Wi-Fi Indoor Propagation Characteristics in a Multi-Floored Building

다국어 초록 (Multilingual Abstract)

Super Wi-Fi is a Wi-Fi-like service exploiting TV whitespace (WS) which is expected to achieve larger coverage thantoday’s Wi-Fi thanks to its superior propagation characteristics.
Super Wi-Fi has been materialized as an international standard,IEEE 802.11af, targeting indoor and outdoor applications, and isundergoing worldwide field tests. This paper demonstrates the truepotential of indoor Super Wi-Fi, by experimentally comparing thesignal propagation characteristics of SuperWi-Fi andWi-Fi in thesame indoor environment. Specifically, we measured the wall andfloor attenuation factors and the path-loss distribution at 770MHz,2.401 GHz, and 5.540 GHz, and predicted the downlink capacityof Wi-Fi and Super Wi-Fi. The experimental results have revealedthat TVWS signals can penetrate up to two floors above and below,whereasWi-Fi signals experience significant path loss even througha single floor. It has been also shown that Super Wi-Fi mitigatesshaded regions of Wi-Fi by providing almost-homogeneous datarates within its coverage, performs comparable to Wi-Fi utilizingless bandwidth, and always achieves better spectral efficiency thanWi-Fi. The observed phenomena imply that SuperWi-Fi is suitablefor indoor applications and has the potential of extending horizontaland vertical coverage of today’s Wi-Fi.

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