NTT Corporation (NTT), NTT DOCOMO and NEC Corporation have announced their successful demonstration of a distributed Multiple-Input Multiple-Output (MIMO) technology system that suppresses the degradation of communication quality in the 40GHz band when a large number of antennas are distributed among multiple locations.
This technology selects the most appropriate antennas and beams at high speed and uses frequency- and timing-compensation technology to prevent significant changes in reception frequency and timing on the mobile-terminal side, even if the terminals are moving at high speed or are shielded by other vehicles moving at high speed.
The demonstration successfully verified the potential of millimetre-wave distributed MIMO to achieve stable, high-capacity wireless communications in high-speed moving environments, such as automobiles and trains, for purposes such as providing large-volume content to many passengers and collecting massive sensing data for automated driving.
In the future, all three companies will proceed with verifications of actual services on roads and railways, with the aim of eventually implementing high-frequency distributed MIMO in high-speed mobile environments, and will also consider the application of distributed MIMO to a wider range of frequency bands, such as the mid-band spectrum, to expand distributed MIMO use.
The results of this demonstration will be exhibited at Tsukuba Forum 2025 on 15-16 May 15 Wireless Japan 2025 × Wireless Technology Park (WTP) (Japanese) from 28-30 May.
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