NEC Corporation has demonstrated multiple highly stable simultaneous terminal connections and transmission capacity in a real office environment through distributed-MIMO in the 28 GHz millimeter-wave frequency band. This demonstration achieved approximately 3 times the number of simultaneous connections and transmission capacity compared to cases without distributed-MIMO in the 28 GHz frequency band. Moreover, transmission deterioration from obstacles was also reduced.
According to NEC research, this is the first demonstration in the industry to apply a distributed-MIMO system in the millimeter-wave frequency band in an office environment. This is expected to contribute to the construction of highly convenient 5G environments that enable simultaneous multiple connections in the future.
Earlier this year, Japan began to commercially deploy 5G in the sub 6 frequency band and millimeter-wave frequency band, with the expectation of enhancing network performance to support 10 times more capacity than 4G, as well as higher throughput, lower latency, and multiple connections.
However, since the usable frequency band of the sub 6 frequency band is more narrow than in the millimeter-wave frequency band, Massive-MIMO systems have been introduced to expand capacity and increase the number of simultaneously connected terminals. Applying Massive-MIMO techniques to millimeter-wave frequency is considered to be optimal for applications where each terminal requires a high transmission capacity, such as indoor offices or stadium seats with high terminal density.