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O

Omni-directional

Receiving signals from or transmitting equally in all directions

Omni-directional antenna

A wireless antenna that radiates or receives electromagnetic fields equally well in all horizontal directions

Operation and Maintenance SubSystem

Functional entity from which the network provider monitors and controls the systems and its maintenance

Operations and Maintenance Center

Central location to operate and maintain the network

Operator

Provider of communication services that owns or controls all elements necessary to deliver services to an end-user

Operator Session

Session existing only one time and being responsible for the setup of a session

Orthogonal Frequency Division Multiple Access

Uses the OFDM method with multiple users by assigning subsets of subcarriers to different users

Orthogonal Frequency Division Multiplex

Digital modulation method that uses multiple carrier frequencies within a channel to carry data

Orthogonality

State where multiple objects are intersecting in a certain way (often referred to 90 degree angles), two vectors are orthogonal if their scalar product is zero