The paper focuses on setting up a UHF white space WhiteFi network without interference with wireless transmissions of primary users and with ability to handle spectrum fragmentation of different width. UHF channel of 30 segments each of 6 MHz width
The authors have implemented WhiteFi on the KNOWS platform that incorporates a Wi-Fi card, a UHF band converter, and SDR. The platform has two key features
1) Variable Channel Widths where the transmitted and received signal can be of bandwidth 5, 10 and 20 MHz. this will impose longer time to scan and discover AP since the scanning has also include the probable combination between the available channels
2) SIFT analyzes incoming signals in the time domain to detect transmissions over different channel widths without changing the channel width of the wireless card. It is able to distinguish intermittent data from noise. SIFT is important to reduce the required time to discover APs that have switched to a different part of the spectrum
WhiteFi requires applying adaptive spectrum-assignment algorithm that periodically reevaluates the assignment based on white space availability at the AP and clients using the spectrum map and airtime utilization observed at each of the clients. AP must pick a channel that is free for all its clients.
The authors have implemented WhiteFi on the KNOWS platform that incorporates a Wi-Fi card, a UHF band converter, and SDR. The platform has two key features
1) Variable Channel Widths where the transmitted and received signal can be of bandwidth 5, 10 and 20 MHz. this will impose longer time to scan and discover AP since the scanning has also include the probable combination between the available channels
2) SIFT analyzes incoming signals in the time domain to detect transmissions over different channel widths without changing the channel width of the wireless card. It is able to distinguish intermittent data from noise. SIFT is important to reduce the required time to discover APs that have switched to a different part of the spectrum
WhiteFi requires applying adaptive spectrum-assignment algorithm that periodically reevaluates the assignment based on white space availability at the AP and clients using the spectrum map and airtime utilization observed at each of the clients. AP must pick a channel that is free for all its clients.
No comments:
Post a Comment