NTT DoCoMo has successfully tested a broadband wireless access system with 1 Gbps downlink capability. The 4G radio access equipment employed variable-spreading-factor spread orthogonal frequency division multiplexing (VSF-Spread OFDM) radio access technology along with multiple-input-multiple-output (MIMO) multiplexing techniques and a new signal detection algorithm in order to achieve the 1Gbps data transmission within 100 MHz of spectrum.
NTT DoCoMo said it is currently conducting indoor tests with various radio conditions as preparation for future field tests to develop a 4G global standard in coordination with the ITU. http://www.nttdocomo.com
