AUTHOR=Dang Shuping , Di Renzo Marco , Wen Miaowen , Chafii Marwa , Ko Youngwook , Uchôa-Filho Bartolomeu F. , Younis Abdelhamid TITLE=Editorial: Index Modulation for 6G Communications JOURNAL=Frontiers in Communications and Networks VOLUME=2 YEAR=2021 URL=https://www.frontiersin.org/journals/communications-and-networks/articles/10.3389/frcmn.2021.794311 DOI=10.3389/frcmn.2021.794311 ISSN=2673-530X