WhiteFi

Network concept over UHF white spaces

Microsoft and HarvardUniversity have tested a transmission of signals over "whitespaces," which is part of the radio spectrum that was formerly used by analog television stations and is still used by wireless microphones.

Microsoft has published a paper that explains networking over UHF white spaces and how it differs from conventional Wi-Fi in spatial variation, temporal variation, and fragmentation of the UHF spectrum.

You can read the paper here (PDF) or more technical summary of it at Dailywireless.

Source: http://www.tomshardware.com/news/Microsoft-WhiteFi-wifi-wireless-whitespaces,8486.html

Note: The protection of wireless microphones is an unsolved problem.