| Summary: | 碩士 === 國立成功大學 === 電腦與通信工程研究所 === 104 === Simultaneous wireless information and power transfer (SWIPT) is an attractive technique to provide wireless data services and energy charging at the same time. Conventionally, it is applied to one-tier networks such as current cellular and WiFi networks where a central station is deployed to serve a number of users in the coverage. As the notion of heterogeneous network becomes emerging, it is of paramount importance to investigate effective SWIPT methods in the context of heterogeneous networks. In this thesis, we consider a two-tier heterogeneous network where the primary tier and the secondary tier are overlaid in the same geographical area. To enable SWIPT in such a heterogeneous network, we consider the time division multiple access (TDMA) and propose the frame structure. To guarantee the service quality in the system, we explore the optimal beamforming design based on two optimization formulations including the transmission power minimization subject to the requirement of data throughput and harvested energy, and the throughput maximization subject to the available transmission power and the harvested energy target. Since both the formulated problems are non-convex in nature, we obtain the optimal solution by applying the semidefinite relaxation (SDR) technique. We investigate the optimality of the SDR solutions and propose methods to improve the throughput of the secondary tier that may suffer severe co-channel interference from the primary tier. Numerical results are provided to evaluate the performance of the proposed optimal beamforming design and compare with some benchmark schemes.
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