| Summary: | 碩士 === 國立交通大學 === 電信工程研究所 === 101 === IEEE 802.15.3c system offers data rates of multiple Gbit/s for applications such as high speed internet access or high quality video streaming and it is operated in unlicensed 57-64 GHz band. However, this band is suffering from high path loss, high penetration loss, and other problems. To alleviate the path loss problem, hybrid planar antenna arrays have been proposed for bemaformed transmission/receiving. In this thesis, we consider LOS/NLOS transmission technologies for 60GHz systems and the localization problem in the multiuser environment. First, we propose a recursive beam matching method, which can find the best transmit and receive beamforming pair. Then, we propose a sensing scheme that can detect the environment change from NLOS to LOS. Finally, we consider the localization problem in the beamformed multiuser environment. We propose two methods, the angle and coordinate method, such that the relative positions of users can be estimated. With the relative positions, beamforming can be conducted for user pairs and multiple parallel transmissions can be scheduled to enhance the system throughput.
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