Question: In UTRA-UE with multi-code transmission, how is the error power for each code defined in the context of Code Domain Error measurement?
Option 1: As the ratio of the mean power of the projection onto the code to the mean power of the composite reference waveform, expressed in dB.
Option 2: As the difference between the peak power of the projection onto the code and the mean power of the composite reference waveform, expressed in watts.
Option 3: By comparing the phase shift of the projected code with the composite reference waveform, measured in degrees.
Option 4: Through the analysis of the code's bit error rate (BER) in relation to the overall signal strength.
Explanation: This is correct because the Code Domain Error measurement specifically involves assessing the power ratio of each code's projection to the composite reference waveform, expressed in decibels (dB), which directly relates to how signal strength and quality are evaluated in wireless communications. This method allows for an effective comparison of signal integrity across different codes within a multi-code transmission scenario.