name: PD
full_form: Power Density
context: The following design criteria have been identified: 1. Full transmit power is used for all beams. 2. Horizontal beam separation shall be the HPBW in the azimuth direction and the vertical beam separation shall be the HPBW in the vertical direction, evaluated for a broadside beam. 3. Lobes with high loss compared to the broadside beam are avoided. By loss we mean the reduction in beamforming gain between different positions of the beam). The motivation for the third criterion is to have a fairly constant TRP for the used beams. The loss can be due to both loss in element pattern gain, but also due to adverse mutual coupling effects. Removing lobes with high loss gives a beam average TRP that is close to the TRP for any individual beam.
description: Power Density (PD) is a parameter used to measure the performance requirement for RACH preamble detection in various propagation conditions, including static, case 3 fading, and high-speed train conditions. It is defined as the required Ec/N0 at a specific probability of detection (Pd), which is set to 0.99 or 0.999.
explanation: The context explicitly states that PD is a parameter used to evaluate the performance of RACH preamble detection, making it a parameter.
section_title: 8.7.1	Performance requirement for RACH preamble detection
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