Similar to TV bands, the guardband frequencies are not occupied
therefore are whitespace that potentially allows additional communication
activities. Considering the difference to TV whitespace,
we propose independent communication for guardband whitespace.
In this paper, we present the Pilotfish system which realizes independent
communication and turns guardband whitespace into new
communication channels. To address the big challenges of interference
mitigation, we employ novel PHY design which includes
specially customized FBMC and an Nulled Decoding technique to
null the strong background signal in guardbands. We implemented
Pilotfish using software radio system. Empirical evaluation results
validate the Pilotfish design in both PHY and MAC.