Channel Hardening of IRS-Aided Multi-Antenna Systems: How Should IRSs Scale?
Channel Hardening of IRS-Aided Multi-Antenna Systems: How Should IRSs Scale?
It is widely believed that large IRS-aided MIMO settings maintain the fundamental features of massive MIMO systems. This work gives a rigorous proof that confirms this belief. We show that using a large passive IRS, the end-to-end MIMO channel between the transmitter and the receiver always hardens, even if the …