@article{environmentawareandtrainingfreebeam,
  title = {Environment-Aware and Training-Free Beam Alignment for mmWave Massive MIMO via Channel Knowledge Map},
  author = {Di wu and Yong Zeng and Shi Jin and Rui Zhang},
  year = {2021},
  eprint = {2102.09871},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2102.09871v1},
}