Reclaiming the White Spaces: Spectrum Efficient Coexistence With Primary Users
Source: Carnegie Mellon University
TV white spaces offer an exciting opportunity for increasing spectrum availability, but White Space Devices (WSDs) cannot interfere with primary users, including TV channels and wireless microphones (mics). Mics are particularly challenging because their use is dynamic and it is hard to avoid interference since mic receivers are receive-only devices. For this reason the FCC and other regulatory agencies have made very conservatives rules that require WSDs to vacate any TV channel that is used by a mic. However, the authors' measurements show that mics typically require only 5% of a channel, wasting as much as 95% of the spectrum. Their present SEISMIC, a systems that enables WSDs and mics to operate on the same TV channel with zero audible mic interference.