@article {1007, title = {A Hybrid Beamforming Design for Massive MIMO LEO Satellite Communications }, journal = {Frontiers in Space Technologies}, volume = {2}, year = {2021}, issn = {2673-5075}, doi = {10.3389/frspt.2021.696464}, url = {https://www.frontiersin.org/articles/10.3389/frspt.2021.696464/full}, author = {Joan Palacios and Nuria Gonz{\'a}lez-Prelcic and Carlos Mosquera and Takayuki Shimizu and Chang-Heng Wang} }