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首页> 外文期刊>IEEE Transactions on Communications >Beamforming Design for Wireless Information and Power Transfer Systems: Receive Power-Splitting Versus Transmit Time-Switching
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Beamforming Design for Wireless Information and Power Transfer Systems: Receive Power-Splitting Versus Transmit Time-Switching

机译：无线信息和功率传输系统的波束成形设计：接收功率分流与发送时间切换

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摘要

Information and energy can be transferred over the same radio-frequency channel. In the power-splitting (PS) mode, they are simultaneously transmitted using the same signal by the base station (BS) and later separated at the user (UE)’s receiver by a power splitter. In the time-switching (TS) mode, they are either transmitted separately in time by the BS or received separately in time by the UE. In this paper, the BS transmit beamformers are jointly designed with either the receive PS ratios or the transmit TS ratios in a multicell network that implements wireless information and power transfer (WIPT). Imposing UE-harvested energy constraints, the design objectives include: 1) maximizing the minimum UE rate under the BS transmit power constraint, and 2) minimizing the maximum BS transmit power under the UE data rate constraint. New iterative algorithms of low computational complexity are proposed to efficiently solve the formulated difficult nonconvex optimization problems, where each iteration either solves one simple convex quadratic program or one simple second-order-cone-program. Simulation results show that these algorithms converge quickly after only a few iterations. Notably, the transmit TS-based WIPT system is not only more easily implemented but outperforms the receive PS-based WIPT system as it better exploits the beamforming design at the transmitter side.
机译：信息和能量可以在同一射频信道上传输。在功率分配（PS）模式下，它们由基站（BS）同时使用相同的信号进行传输，然后由功率分配器在用户（UE）的接收器处分离。在时间切换（TS）模式下，它们要么由BS在时间上分别发送，要么由UE在时间上单独接收。在本文中，在实现无线信息和功率传输（WIPT）的多小区网络中，将BS发送波束成形器与接收PS比率或发送TS比率共同设计。施加UE收集的能量约束，设计目标包括：1）在BS发射功率约束下最大化最小UE速率，以及2）在UE数据速率约束下最小化最大BS发射功率。提出了一种新的计算复杂度低的迭代算法，可以有效地解决所提出的困难的非凸优化问题，其中每次迭代都可以求解一个简单的凸二次程序或一个简单的二阶圆锥程序。仿真结果表明，这些算法仅经过几次迭代即可快速收敛。值得注意的是，基于发送TS的WIPT系统不仅更易于实现，而且性能优于基于接收PS的WIPT系统，因为它更好地利用了发射机侧的波束成形设计。

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