name: OBO
full_form: Output Backoff
context: The use of CP-OFDM in the downlink does not restrict NR operation in non-terrestrial networks, but it may affect the system performance: - In one case, a satellite transponder is sufficiently wide and sufficiently powerful to accommodate more than one FDM carriers, each of which is a different NR CP-OFDM signal. The satellite amplifier is backed off to minimize the intermodulation between these FDM carriers within the same transponder. For such cases, the distortion introduced by the amplifier nonlinearity is small, with little impact. - In second and much more common case for communicating to small UEs, the satellite amplifier is used to send only one NR CP-OFDM downlink. It is highly desirable to operate the amplifier with as small OBO as possible. But, due to the higher PAPR of CP-OFDM signal, sufficient OBO is necessary. To close the link, it may be necessary to reduce the size of CP-OFDM carrier or operate the CP-OFDM carrier with a lower modulation and coding mode. Either way,
description: Output Backoff (OBO) is a critical network attribute that refers to the reduction in power amplifier output to minimize intermodulation distortion between Frequency Division Multiplexing (FDM) carriers within the same transponder, particularly when using Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) signals in non-terrestrial networks.
explanation: The context describes OBO as a specific setting or adjustment made to the network, aiming to improve performance by controlling amplifier output and mitigating signal interference. This classification as a Parameter stems from its role as a configurable element influencing system behavior.
section_title: 7.3.7.2.2Assessment of conditions for NR operation in Non-Terrestrial networks
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