name: CDL
full_form: Clustered Delay Line
context: The angle values of CDL models are fixed, which is not very suitable for MIMO simulations for several reasons; The PMI statistics can become biased, and a fixed precoder may perform better than open-loop and on par with closed-loop or reciprocity beamforming. Furthermore, a CDL only represents a single channel realization. The predefined angle values in the CDL models can be generalized by introducing angular translation and scaling. By translation, mean angle can be changed to and angular spread can be changed by scaling. The translated and scaled ray angles can be obtained according to the following equation: (7.7-5) in which: is the tabulated CDL ray angle is the rms angular spread of the tabulated CDL including the offset ray angles, calculated using the angular spread definition in Annex A is the mean angle of the tabulated CDL is the desired mean angle is the desired rms angular spread is the resulting scaled ray angle. The angular scaling is applied on the ray angles including
description: Clustered Delay Line (CDL) is a channel model used in telecommunications to simulate the behavior of radio channels, particularly in Multiple-Input Multiple-Output (MIMO) systems. It represents a single channel realization and can be generalized by introducing angular translation and scaling to change mean angle and angular spread.
explanation: The description explicitly states that CDL is a 'channel model' used in telecommunications for simulating radio channels, placing it within the realm of technological concepts and standards.
section_title: 7.7.5.1CDL extension: Scaling of angles
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