AUTHOR=da Costa Daniel Benevides , Yang Hong-Chuan TITLE=Grand Challenges in Wireless Communications JOURNAL=Frontiers in Communications and Networks VOLUME=1 YEAR=2020 URL=https://www.frontiersin.org/journals/communications-and-networks/articles/10.3389/frcmn.2020.00001 DOI=10.3389/frcmn.2020.00001 ISSN=2673-530X