Measurement-Based Multiband Clutter Loss Modeling for Nonterrestrial Networks

Nonterrestrial networks (NTNs) have attracted great interest in the development of 6G communication systems. Hence, it is very important to develop an accurate NTN clutter loss (CL) model for the deployment and optimization of NTN communications. In this work, we conduct a multiband channel measurement for the CL of NTN channels in a campus scenario, including 8.5, 10, and 13 GHz. A semideterministic model for the CL related to elevation and frequency is constructed, and a heuristic interpretation for the modeling process is provided based on: 1) the variation of the energy flux density due to the ray-tube effect of the NTN channel and 2) the channel sparsity on angular domain. The obtained results are helpful for the accurate understanding of the NTN channel, which is essential for the development of NTN communications.