Question: In the UE adjacent channel Tx model for NR duplex operation, how does the Adjacent Channel Leakage Ratio (ACLR) improve with power backoff up to a maximum of 10 dB of improvement?
Option 1: ACLR degrades by 0.5 dB/dB with backoff, capping at a 5 dB worsening at 10 dB backoff.
Option 2: ACLR remains constant at 30 dB regardless of the power backoff level.
Option 3: ACLR improves by 1 dB/dB with backoff, reaching up to 40 dB at 10 dB backoff.
Option 4: ACLR worsens by 1 dB for every 2 dB of backoff until it reaches a maximum deterioration of 15 dB at 10 dB backoff.
Explanation: According to the UE adjacent channel Tx model, ACLR starts at 30 dB at maximum power and improves linearly with power backoff. Specifically, for every decibel (dB) of power backoff, the ACLR improves by 1 dB, up to a maximum improvement of 10 dB. Therefore, at a 10 dB backoff, the ACLR would indeed improve to 40 dB. This model highlights how reducing transmission power can lead to better spectral containment in adjacent channels, crucial for minimizing interference in wireless communication systems.