@article{EURECOM+6436, author = {Maschietti, Flavio and Fodor, Gabor and Gesbert, David and de Kerret, Paul}, title = {User coordination for fast beam training in FDD multi-user massive MIMO}, journal = {IEEE Transactions on Wireless Communications, 29 December 2020}, year = {2020}, note = {© 2020 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.}, }