Question: What is the condition for determining the wideband CQI index for codeword #1 in a TDD system, and what should be the resulting wideband values CQI1 for more than 90% of the time?
Option 1: The reported offset level of the wideband spatial differential CQI for codeword #1 is used to determine the wideband CQI index for codeword #1, and the resulting wideband values CQI1 should be within the set {median CQI1 -2, median CQI1, median CQI1 +2}.
Option 2: The reported offset level of the wideband spatial differential CQI for codeword #1 is used to determine the wideband CQI index for codeword #1, and the resulting wideband values CQI1 should be within the set {median CQI1 -1, median CQI1, median CQI1 +1}.
Option 3: The reported offset level of the wideband spatial differential CQI for codeword #0 is used to determine the wideband CQI index for codeword #1, and the resulting wideband values CQI1 should be within the set {median CQI1 -1, median CQI1, median CQI1 +1}.
Option 4: The reported offset level of the wideband spatial differential CQI for both codewords #0 and #1 is used to determine the wideband CQI index for codeword #1, and the resulting wideband values CQI1 should be within the set {median CQI1 -2, median CQI1, median CQI1 +2}.
Explanation: According to the text, the reported offset level of the wideband spatial differential CQI for codeword #1 is used to determine the wideband CQI index for codeword #1 as wideband CQI1 = wideband CQI0 – Codeword 1 offset level. The resulting wideband values CQI1 should be within the set {median CQI1 -1, median CQI1, median CQI1 +1} for more than 90% of the time.