Question: What is the primary purpose of Intermodulation Response Rejection in a UE (User Equipment) receiver, particularly relevant to FDD UEs supporting HSDPA and Dual Cell E-DCH?
Option 1: To enhance the transmission power of the desired signal in the presence of multiple wanted signals.
Option 2: To measure the receiver's ability to filter out thermal noise generated within the UE itself.
Option 3: To assess the UE's capacity to handle simultaneous connections on different frequency bands.
Option 4: To evaluate the receiver's capability to receive a desired signal in its assigned channel frequency while rejecting interfering signals with specific frequency relationships.
Explanation: Intermodulation Response Rejection is crucial for maintaining signal integrity in the presence of interference. Third and higher order mixing of two or more interfering RF signals can generate an interfering signal within the desired channel's band. This measures the UE's ability to receive the wanted signal on its assigned frequency despite specifically related interfering signals, ensuring quality and reliability in wireless communications.