| Publisher | Association for Computing Machinery | ||
|---|---|---|---|
| Format | 1.8MB PDF | Date added | 21 Aug 2009 |
| Topics | Mobile - Wireless Communications, Wi-Fi (802.11) | ||
| Downloads | 1 | ||
Networking over UHF white spaces is fundamentally different from conventional Wi-Fi along three axes: spatial variation, temporal variation, and fragmentation of the UHF spectrum. Each of these differences gives rise to new challenges for implementing a wireless network in this band. The paper presents the design and implementation of WhiteFi, the first Wi-Fi like system constructed on top of UHF white spaces. WhiteFi incorporates a new adaptive spectrum assignment algorithm to handle spectrum variation and fragmentation, and proposes a low overhead protocol to handle temporal variation. WhiteFi builds on a simple technique, called SIFT, that reduces the time to detect transmissions in variable channel width systems by analyzing raw signals in the time domain.
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