Question: What does ACLR (Adjacent Channel Leakage Ratio) measure in the context of a UTRA FDD User Equipment (UE)?
Option 1: The ratio of RRC filtered mean power centered on an adjacent channel frequency to the RRC filtered mean power centered on the assigned channel frequency.
Option 2: The absolute RRC filtered mean power centered on the assigned channel frequency in a UTRA FDD UE.
Option 3: The ratio of the RRC filtered mean power centered on the assigned channel frequency to the RRC filtered mean power centered on an adjacent channel frequency.
Option 4: The variation in RRC filtered mean power across different channel frequencies in a UTRA TDD (Time Division Duplexing) UE.
Explanation: ACLR measures the amount of power leaking into adjacent channels from the assigned channel. It accurately assesses this by measuring the ratio of the power in the adjacent channel to the power in the assigned channel, reflecting how much of the signal is 'leaking' into neighboring frequencies, crucial for maintaining signal integrity and minimizing interference.