Extreme Massive MIMO for Upper-Mid Band 6G Communications

It is necessary to study the frequency characteristics in the upper-mid band, one of the new frequency candidates of 6G, and the extreme massive MIMO scheme using it. Research on a fully digital massive MIMO precoding method has drawn much attention to achieve near optimal performance with low complexity by exploiting the channel characteristics. In 6G, It is desired to utilize appropriate MIMO schemes suitable for upper-mid bands to provide not only peak data rate up to 1 Tbps but also user experienced rate up to 1 Gbps anywhere anytime, However the channel characteristics in the upper-mid band at the mobile communication environment are not yet known. In this paper, an exemplary multi-user MIMO channel is tested in the upper-mid band by utilizing ray-tracing, investigate the channel characteristics, and to show possible the corresponding MU-MIMO schemes.