Question: In calculating Code-Domain Power in a 3GPP-compliant FDD system, what is the primary purpose of descrambling the time-sequential vectors `z` to obtain `z'` before proceeding with further calculations?
Option 1: To reduce computational complexity by minimizing the number of orthogonal vectors needed from the channelization code set.
Option 2: To ensure meaningful results by reversing the scrambling effect, allowing for accurate inner product calculation with normalized channelization codes.
Option 3: To enhance security by introducing an additional layer of encryption prior to power calculations.
Option 4: To filter out noise and interference that may have been introduced during symbol interval creation.
Explanation: Descrambling `z` to obtain `z'` is crucial for achieving meaningful results in Code-Domain Power calculation. This step reverses the scrambling applied to the original signal, enabling accurate computation of the inner product between the descrambled signal (`z'`) and the normalized channelization codes (`Cnorm`). This accuracy is vital for correctly assessing power distribution across different codes within the code space.