论文标题
无线电力传输的波形设计，具有功率放大器和能量收割机非线性
Waveform Design for Wireless Power Transfer with Power Amplifier and Energy Harvester Non-Linearities
论文作者
论文摘要
波形优化显示了其巨大的潜力，可以提高远场无线功率传输（WPT）的性能。当前的研究优化了对通道状态信息（CSI）的传输波形，以最大程度地提高WPT中的收获功率，同时考虑到能量收割机（EH）的非线性。但是，现有的发射波形设计无视发射机处的非线性高功率放大器（HPA）。在此驱动的情况下，本文在HPA的输入下优化了多载波波形，以最大程度地考虑HPA和EH的非线性。两个优化模型是根据是否集中在发送传递带中的多载波波形的频率来制定的。分析和模拟表明，尽管EH的非线性增强了功率收获性能，但HPA的非线性降低了收获的力量。因此，最佳波形从利用EH的非线性性的多载波转变为单载波，随着WPT的运营状态对HPA的非线性性更敏感，对HPA的非线性敏感，并且对EH的非线性（并且是不相反的）。同时，通过增加输入信号功率使收获的功率增加收获的功率，因为HPA的DC电源更好地利用了收获的功率，而端到端电源传递效率（PTE）可能会降低，因为非线性降解可能会降低。在整个模拟中，所提出的波形在不考虑HPA的非线性的情况下显示出显着的增益，尤其是在频率燃烧通道中。我们还比较了两个提出的波形，并表明HPA非线性的严重性决定了两个提出的波形中的哪一个更有益。
Waveform optimization has shown its great potential to boost the performance of far-field wireless power transfer (WPT). Current research has optimized transmit waveform, adaptive to channel state information (CSI), to maximize the harvested power in WPT while accounting for energy harvester (EH)'s non-linearity. However, the existing transmit waveform design disregards the non-linear high power amplifiers (HPA) at the transmitter. Driven by this, this paper optimizes the multi-carrier waveform at the input of HPA to maximize the harvested DC power considering both HPA's and EH's non-linearities. Two optimization models are formulated based on whether the frequencies of the multi-carrier waveform are concentrated within the transmit pass band or not. Analysis and simulations show that, while EH's non-linearity boosts the power harvesting performance, HPA's non-linearity degrades the harvested power. Hence, the optimal waveform shifts from multi-carrier that exploits EH's non-linearity to single-carrier that reduces HPA's detrimental non-linear distortion as the operational regime of WPT becomes more sensitive to HPA's non-linearity and less sensitive to EH's non-linearity (and inversely). Simultaneously, operating towards HPA's non-linear regime by increasing the input signal power benefits the harvested power since HPA's DC power supply is better exploited, whereas the end-to-end power transfer efficiency (PTE) might decrease because of the increasing non-linear degradation. Throughout the simulations, the proposed waveforms show significant gain over those not accounting for HPA's non-linearity, especially in frequency-flat channels. We also compare the two proposed waveforms and show that the severity of HPA's non-linearity dictates which of the two proposed waveforms is more beneficial.
