I am one of the guest editors of the JSAC special issue on “Multiple Antenna Technologies for Beyond 5G” which had its submission deadline on October 1. We received 133 submissions that span emerging topics such as Cell-free Massive MIMO, intelligent reflective surfaces, terahertz communications, new hardware architectures (e.g., lens arrays), and index modulation. It will take a lot of hard work to review all these submissions, but I am convinced that the selected papers will be of high quality and present a range of interesting concepts that can be utilized in beyond 5G systems.

In addition to the technical papers, the guest editors have also written a survey paper that has the same name as the special issue. A draft of it is available on arXiv. This paper describes the state-of-the-art and open problems related to several of the topics described above.