DICTIONARY
Common terms & acronyms used in wireless industry
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DAS - Distributed Antenna System -
DAS is a network of antennas designed to provide coverage (wireless signals) to an area with little or no otherwise coverage. This could be inside a building or a small defined geographic region.
Date Plane -
The part of a network through which user packets are
transmitted. It is often included in diagrams and illustrations to
give a visual representation of user traffic. Also known as the
user plane, forwarding plane, or carrier plane.
DFF - Direct Far Field -
An over-the-air (OTA) test method used in 5G that involves
mounting the device under test (DUT) on a positioner that
rotates in azimuth and elevation. This process enables
measurement of the DUT at any angle on the full 3D sphere.
The DFF method can perform the most comprehensive tests
measuring multiple signals and requires a larger test chamber
for mmWave devices.
DFT-s-OFDM – Discrete Fourier Transform Spread Orthogonal Frequency Division Multiplexing -
An optional modulation format used in the uplink in 5G NR.
DFT-s-OFDM uses the mathematical concept of discrete
Fourier transform to encode digital data on multiple frequency channels in a frequency division multiplexing scheme, increasing
bandwidth, and decreasing response time.
DL - Downlink -
The path of transmission from the base station to the user
equipment (UE). In 5G, the DL waveform is orthogonal frequency
division multiplexing (OFDM).
DUT - Device Under Test -
Device under test (DUT), equipment under test (EUT), system
under test (SUT) and unit under test (UUT) are terms used to
refer to a device undergoing measurement procedures.
DWDM - Dense Wave Division Multiplexing -
An optical technology that allows for more than eight separate signals over a single strand of fiber optic cable. It is usually reserved for digital data transmission.
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