Question: In UTRA-UE, how is the Error Vector Magnitude (EVM) result defined for Radio transmission and reception in TDD mode?
Option 1: As the square root of the ratio of the mean error vector power to the mean reference signal power, expressed as a percentage.
Option 2: As the absolute difference between the measured waveform and theoretical modulated waveform peak amplitudes.
Option 3: By calculating the standard deviation of the phase difference between the two waveforms over one frame.
Option 4: Through the integration of error vector power over a single subframe, normalized by the reference signal's energy.
Explanation: The correct definition of EVM in this context involves comparing the power of the error vector to the reference signal power, which directly relates to the quality of the modulated waveform. This comparison, expressed as a percentage after taking the square root, provides a normalized measure of the modulation accuracy, making Option 1 the accurate description of how EVM is defined for UTRA-UE in TDD mode.