Research Topics

In our laboratory, we aim to develop spectral- and energy-efficient wireless communication systems.

One of the main goals of wireless communications is high speed data transmission with low energy consumption. The high speed data transmission can be realized by advanced physical layer technologies such as massive multiple-input multiple-output (MIMO) technology and multi-carrier transmission. It is known that energy-efficiency (EE) is similarly important as spectrum-efficiency (SE). The traffic demand of wireless communications system dynamically changes according to the location and the time. By taking into account such a dynamics, it is possible to realize more energy-efficient wireless communications system.

The current wireless communications systems adopt a central controlled system architecture. For example, in cellular communications systems, a base station (BS) is controlling the whole transmission within its coverage area. In future, huge number of devices such as wireless sensors will be integrated into our life. It is not appropriate that such a huge number of devices are controled by a central controller. Therefore, it is important that each wireless device monitor its surrounding environment and learn the optimum behavior such as active/sleep selection. A learning assisted wireless communications systems can achieve this goal.

It is predicted that everything in our life will be connected via either wired or wireless communications technologies. Wirless sensor network (WSN) is one main application of the Internet-of-Things (IoT). In WSN, battery-powered sensor devices monitor surrounding environments and reports the measurement result to information server.