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I

ID

Identifier for a user or an equipment

Ideal dipole

Combination of two opposite charges of the same magnitude having a very small distance between them

IEEE 802.11

Standard for wireless local area networks (WLAN)

IK

Key for integrity protection in UMTS

IMEI

Unique number identifying mobile hardware


Impendance

Electrical impedance: the ratio of the voltage phasor to the electric current phasor, a measure of the opposition to time-varying electric current in an electric circuit

Impendance matching

Designing the input impedance of an electrical load or the output impedance of its corresponding signal source to maximize the power transfer or minimize signal reflection from the load

Impulse response

Output signal of a system to which a Dirac pulse is fed at the input. Since the impulse function contains all frequencies, the impulse response defines the response of a linear time-invariant system for all frequencies.

IMS

System integrating voice and Internet service

Integrated Services Digital Network

A set of communication standards for digital telephone connection and the transmission of voice and data over a digital line

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