Joint Downlink and Uplink Resource Allocation for Multi-user Multi-carrier Simultaneous Wireless Information and Power Transfer Systems
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摘要: 无线携能通信(SWIPT)技术是解决无线网络能量受限问题的有效方法，该文研究一个由基站(BS)和多用户组成的多载波SWIPT系统，其上行和下行链路均采用正交频分复用(OFDM)技术。在下行链路中，基站向用户同时进行信息与能量传输；在上行链路中，用户利用从基站接收的能量向基站回传信息。该文以最大化上下行加权和速率为目标，联合优化上行和下行的子载波分配和功率分配，提出基于拉格朗日对偶法和椭球法的最优联合资源分配算法。计算机仿真结果证实了该算法的有效性。Abstract: Simultaneous Wireless Information and Power Transfer (SWIPT) is an effective technique to solve the energy limitation problem of wireless networks. A multi-carrier SWIPT communication system that includes one Base Station (BS) and multiple users is investigated. Both the uplink and downlink of the system apply the OFDM transmission. In the downlink, the BS transmits information and power over different subcarriers to the users simultaneously. In the uplink, the user transmits information to the BS by using the power harvested from the BS in the downlink. This paper aims to maximize the weighted sum of the downlink and uplink achievable rates by jointly optimizing subcarrier allocation and power allocation of the uplink and downlink. An optimal algorithm is proposed to solve this resulted optimization problem, which is based on the Lagrange duality method and the ellipsoid method. The performances of the proposed algorithm are verified by computer simulations.
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