Question: In a UTRA FDD UE supporting HSDPA and E-DCH, when calculating the Nominal Code Domain Power (CDP) ratio for 16QAM modulation, what adjustment is made to the βed value?
Option 1: A fixed correction factor of 0.5 dB is added to the βed value.
Option 2: The βed value is multiplied by a factor derived from the symbol fractions (00, 01, 10, 11) as per a predefined formula.
Option 3: No adjustment is made; the nominal CDP ratio remains unchanged for all modulation schemes.
Option 4: The βed value is divided by the sum of all nominal CDPs, which equals 1 by definition, and then a square root of the sum of squared fractions of symbols is applied.
Explanation: For 16QAM modulation in UTRA FDD UEs supporting HSDPA and E-DCH, the Nominal CDP calculation involves adjusting the βed value using a formula that incorporates the fractions of symbols (A1, A2, A3, A4 for symbols 00, 01, 10, 11 respectively) transmitted during the test. This adjustment is specifically tailored to account for the modulation scheme's impact on power distribution among codes, ensuring accurate relative code domain power settings. The correct formula involves squaring and summing these fractions with specific coefficients before taking the square root, which matches Option 4's description.