name: ACM
full_form: Adaptive Modulation and Coding
context: oscillations between two ACM modulation coding modes. But, this reaction time is too slow for ACM to adapt for changes of signal strength for mobile terminals when line of sight is interrupted by shadowing. For GEO systems in S-band, the main issue is multipath fading, which can be much faster than Â½ second round trip delay. As such, ACM will not be able to follow it. ACM algorithm typically attempts to settle on a modulation coding mode that closes the link if possible, by giving up some power to maintain a margin. For LEO satellites, ACM may also be used to adapt for the large variation of free space loss. The variation is sufficiently slow compared to the 20 ms worst case round trip delay. It should also be able to react to shadowing fades to a large extent, but still unable to follow fast fading.
description: Adaptive Modulation and Coding (ACM) is a technology used in telecommunications to adapt the modulation and coding scheme of a signal based on the channel conditions. It aims to optimize the transmission by adjusting the modulation and coding to match the current channel state, thereby improving the link quality and reliability.
explanation: The context describes ACM as a mechanism for adapting signal transmission based on channel conditions, directly impacting the performance and reliability of communication links. This adaptive nature and its role in optimizing telecommunication signals firmly place it within the category of Technology.
section_title: 7.3.3.3.2Assessment of conditions for NR operation in Non-Terrestrial networks
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