@article{hierarchicalmtcuseractivitydetectionand,
  title = {Hierarchical MTC User Activity Detection and Channel Estimation with Unknown Spatial Covariance},
  author = {Hamza Djelouat and Mikko J. Sillanpää and Markus Leinonen and Markku Juntti},
  year = {2023},
  eprint = {2310.10204},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2310.10204v1},
}