Question: In the context of testing a Terminal's (TX) output signal conformance in a FDD system, what is a key characteristic of the reference signal generated by the measuring equipment for comparison purposes?
Option 1: It contains a single code with a variable spreading factor to simulate dynamic network conditions.
Option 2: It is composed of the same number of codes at the correct spreading factors as contained in the test signal, representing an ideal error-free received signal.
Option 3: It consists of a predefined sequence of signals with randomly assigned spreading factors to stress-test the receiver.
Option 4: It is a simplified signal using only one spreading factor for all codes, regardless of the test signal's composition.
Explanation: This option correctly highlights that the reference signal must mirror the test signal's structure in terms of the number of codes and their respective spreading factors. This ensures a fair comparison between the actual output signal and an ideal, error-free counterpart, which is crucial for assessing the Terminal's conformance to transmission standards in a FDD system.