Fujitsu Laboratories has announced that they have conducted successful field testing for LTE using 4×4 MIMO. The trials, in collaboration with DoCoMo, took place in Hokkaido and resulted in wireless data transmissions in the range of 120 Mbps (using 10 MHz bandwidth) in Sapporo’s urban environment. This would be equivalent to 240 Mbps throughput using the 20 MHz maximum bandwidth that LTE allows.
Fujitsu and Fujitsu Laboratories were selected by NTT DOCOMO in 2006 to be the developer and manufacturer of their wireless LTE base stations. Since then, they have worked together with NTT DOCOMO to develop these technologies using 4×4 MIMO, which increases speed and capacity in both transmitting base stations and receiving mobile stations, and the three companies have performed successful tests of a prototype three-sector LTE base station that has a transmission capacity of 300 Mbps per sector on the downlink (20 MHz band).
The field testing involved LTE transmissions using NTT DOCOMO test stations in Sapporo’s urban environment, assessing the throughput characteristics of 4×4 pre-coding MIMO(4) on the downlink and confirming that a maximum of 120 Mbps (using 10 MHz bandwidth) could be attained over a measured course. These tests revealed that the adaptive switching used in MIMO multiplexing was effective in achieving stable throughput in outdoor carrier environments.