Far-field wireless power transfer (WPT) and simultaneous wireless information and power transfer (SWIPT) have become increasingly important in radio frequency (RF) and communication communities recently. The problem of modulation design for SWIPT has however been scarcely addressed. In this paper, a modulation scheme based on asymmetric phase-shift keying (PSK) is considered, which improves the SWIPT rate-energy trade-off region significantly. The nonlinear rectifier model, which accurately models the energy harvester, is adopted for evaluating the output direct current (DC) power at the receiver. The harvested DC power is maximized under an average power constraint at the transmitter and a constraint on the rate of information transmitted via a multi-carrier signal over a flat fading channel. As a consequence of the rectifier nonlinearity, this work highlights that asymmetric PSK modulation provides benefits over conventional symmetric PSK modulation in SWIPT and opens the door to systematic modulation design tailored for SWIPT.

中文翻译：

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具有非线性能量收集的无线信息和电力传输的非对称调制设计

最近，远场无线电力传输 (WPT) 和同步无线信息和电力传输 (SWIPT) 在射频 (RF) 和通信社区中变得越来越重要。然而，SWIPT 的调制设计问题几乎没有得到解决。在本文中，考虑了一种基于非对称相移键控 (PSK) 的调制方案，该方案显着改善了 SWIPT 速率-能量权衡区域。采用非线性整流器模型对能量收集器进行精确建模，用于评估接收器的输出直流 (DC) 功率。在发射机处的平均功率约束和通过平坦衰落信道上通过多载波信号传输的信息速率的约束下，获得的直流功率最大化。由于整流器非线性，