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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