Question: For a User Equipment (UE) supporting Dual-Band Dual-Cell High-Speed Downlink Packet Access (DB-DC-HSDPA) in Frequency Division Duplexing (FDD) mode, what is the primary purpose of measuring Adjacent Channel Selectivity (ACS)?
Option 1: To evaluate the UE's transmitter power in adjacent channels.
Option 2: To assess the UE's ability to handle simultaneous voice and data transmission.
Option 3: To determine the receiver's capability to filter out adjacent channel signals while receiving a W-CDMA signal on its assigned channel frequency.
Option 4: To test the UE's handover performance between different base stations.
Explanation: Adjacent Channel Selectivity (ACS) is crucial for measuring how well a receiver can isolate and receive a desired W-CDMA signal on its assigned channel while rejecting signals from adjacent channels, which is vital for maintaining signal integrity and quality in densely populated frequency bands. This directly relates to the receiver's filtering capabilities in the presence of nearby interference, making Option 3 the correct answer as it accurately describes the primary purpose of measuring ACS in the context of DB-DC-HSDPA capable FDD UEs.