IEEE & Queens University Belfast: Road to 6G, 10 Physical Layer Challenges

This paper by Queens University Belfast, published in the IEEE Communications Magazine, looks at some of the fundamental problems that pertain to key physical layer enablers for 6G. This includes highlighting challenges related to intelligent reflecting surfaces, cell-free massive MIMO and THz communications. Our analysis covers theoretical modeling challenges, hardware implementation issues and scalability among others. The paper concludes by delineating the critical role of signal processing in the new era for wireless communications.