Question: For a UTRA FDD UE supporting HSDPA and Dual Cell E-DCH, with dual adjacent carriers assigned on the uplink, how is the Adjacent Channel Leakage Ratio (ACLR) defined in terms of measured powers?
Option 1: ACLR is the ratio of the RRC filtered mean power centred on one assigned channel frequency to the RRC filtered mean power centred on an adjacent channel frequency.
Option 2: ACLR is the difference between the RRC filtered mean power centred on each assigned channel frequency and the RRC filtered mean power centred on an adjacent channel frequency.
Option 3: ACLR is the ratio of the RRC filtered mean power centred on one assigned channel frequency to the sum of the RRC filtered mean powers centred on two adjacent channel frequencies.
Option 4: ACLR is the ratio of the sum of the RRC filtered mean powers centred on each of the two assigned channel frequencies to the RRC filtered mean power centred on an adjacent channel frequency.
Explanation: This definition aligns with the provided context, emphasizing that when dual adjacent carriers are utilized in the uplink for UEs supporting HSDPA and Dual Cell E-DCH, ACLR calculations must account for both assigned channels to accurately measure leakage into adjacent channels in modern wireless communication systems.