@article{twotimescalechannelestimationforris,
  title = {Piecewise Beam Training and Channel Estimation for RIS-Aided Near-Field Communications},
  author = {Jeongjae Lee and SongNam Hong},
  year = {2025},
  eprint = {2501.02985},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2501.02985v2},
}