Technology for next-generation digital terrestrial broadcasting — Field experiments of 8K Super Hi-Vision transmission using dual-polarized MIMO and ultra-multilevel OFDM

We are conducting research on the next generation of digital terrestrial broadcasting to enable large-volume content services such as 8K Super Hi-Vision. We have installed an experimental station for 8K transmissions in Hitoyoshi city, Kumamoto prefecture, Japan that uses dual-polarized multiple-input multiple-output (MIMO) technology and ultra-multilevel orthogonal frequency division multiplexing (OFDM) technology and conducted two 8K field experiments: a transmission test, and field measurements at 52 points in the Hitoyoshi area. In these experiments, we succeeded in carrying out the world´s first terrestrial 8K transmission (91 Mbps) at a distance of over 27 km using only a single UHF (ultra-high frequency) channel (BW:6 MHz). We also measured the required field strength for the 256QAM, 1024QAM, and 4096QAM carrier modulation schemes as well as the responses of dual-polarized MIMO transmission channels.