Edited by Masahiro Morikura C1. Mobile High Bit-rate Transmission

In fourth-generation mobile communication systems, the maximum bit rate is aimed at 1 Gbps [3GPP, 2011] and demand for higher bit-rate transmission has been rapidly growing. This section surveys experiments for the mobile high bit-rate transmission. First, 12×12 Multiple-Input Multiple-Output (MIMO) transmission with the signal bandwidth of 100 MHz achieved 5 Gbps [Taoka, 2008]. In addition, 10 Gbps transmissions using higher frequency bands over 5 GHz were discussed at a 3GPP workshop focusing the post LTE-Advanced era [NTT DOCOMO, 2012]. Moreover, 11 GHz band super high bit-rate mobile communications attaining over 30 Gbps have been investigated [Suzuki, 2010], [Umeda, 2010]. As experiments of the super high bit rate, a 10 Gbps transmission experimental system using 8×16 MIMO-Orthogonal Frequency Division Multiplexing (OFDM) was developed [Suyama, 2012], [Suyama, 2013], and 10 Gbps transmission experiments succeeded as the world’s first 10 Gbps experiment in outdoor mobile environments in December 2012 [Suyama, 2013]. On the other hand, in order to analyze a radio propagation mechanism, an 11 GHz band channel sounder that supports the maximum of 24×24 MIMO was developed [Konishi, 2012], and channel measurement and analysis were performed in indoor and outdoor propagation experiments [Kim, 2013], [Chang, 2013]. The MIMO channel sounder shares 11 GHz band transmitter and receiver with the transmission experimental system; however, the installed software packages are different. Although 24×24 MIMO transmission is expected to achieve over 30 Gbps bit rate, an 11 GHz band 30 Gbps transmission experiment has not been carried out because high power amplifiers (HPAs) for only 8 transmitter antennas were available [Suyama, 2013]. Therefore, to verify the feasibility of the 30 Gbps transmission for future mobile communications, performance of 30 Gbps MIMO-OFDM eigenmode transmission has been demonstrated by computer simulations using channel data that the 11 GHz band 24×24 MIMO channel sounder measured. (K. Fukawa)