Question: In the context of global in-channel TX testing for Base Stations (BS), as per 3GPP standards, which of the following parameters is classified as a "residual" type measurement result, indicating an ideal magnitude of zero?
Option 1: RF Frequency Power (in case of single code)
Option 2: Code Domain Power (in case of multi-code)
Option 3: Timing (specific to User Equipment - UE)
Option 4: Error Vector Magnitude (EVM)
Explanation: Error Vector Magnitude (EVM) measures the difference between the ideal and actual constellation points in a signal, essentially quantifying the error in the signal. Since the ideal magnitude of error in a signal is zero (i.e., no deviation from the expected signal), EVM falls under "residual" type measurement results, which are defined by having an error-free parameter value of zero. This classification highlights the parameter’s role in assessing signal quality and integrity in telecom networks.