OECD
Organisation for Economic Co-operation and Development

OFDM
Orthogonal frequency division multiplexing.
A method of digital modulation in which a signal is split into several narrowband channels at different frequencies in order to minimize interference among channels that are close in frequency. OFDM is used in European digital audio broadcast services, and also in wireless LANs.

Open access
The creation of competition in all layers of the network, allowing a wide variety of physical networks and applications to interact in an open architecture. (infoDev 2005)

Overlay spectrum sharing
Occurs when a band already licensed to an operator is shared with others.