Keynote talk #2: Distributed MIMO cooperative signal transmission for 5G

After 35 years from its birth in 1979, mobile wireless communications networks have evolved into the 4th generation (4G). The mobile data traffic volume is growing explosively and therefore, significantly advanced spectrum- and energy-efficient wireless communication technology needs to be developed for the 5th generation (5G) mobile wireless communications networks. One promising approach is to adopt a distributed antenna smallcell network, in which a number of distributed antennas are deployed over a macro-cell area. Distributed antennas surrounding a user and user antennas form distributed MIMO channel. In this presentation, two types of distributed MIMO cooperative signal transmission technique are presented. One is space-time block coded (STBC) diversity, which aims to improve the macro-cell edge users' throughput. The other is multi-user joint transmit/receive filtering, which aims to improve the sum-throughput of users in a good channel condition. When using cooperative signal transmission, peak-to-average power ratio (PAPR) of the transmit signal is increased. Therefore, PAPR reduction will be still necessary for battery-operated user terminal transmit power amplifiers. Blind selected mapping (blind SLM) which can effectively suppress the PAPR and requires no side information sharing is presented.