Wireless information and power transfer: Architecture design and rate-energy tradeoff
Wireless information and power transfer: Architecture design and rate-energy tradeoff
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DOI：
10.1109/glocom.2012.6503739
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发表时间：
2012-05
期刊：
影响因子：
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通讯作者：
Xun Zhou;Rui Zhang;Chin Keong Ho
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文献类型：
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作者：
Xun Zhou;Rui Zhang;Chin Keong Ho
通过无线信道同时进行信息和能量传输可能会给移动用户带来极大的便利。然而，实际的接收器设计对其硬件实现存在技术限制，因为从无线电信号中获取能量的实际电路还无法直接对所携带的信息进行解码。为了在理论上取得进展，我们提出了一种通用的接收器操作，即动态功率分配（DPS），它将接收到的信号按可调节的功率进行分配，用于能量收集和信息解码。此外，我们还提出了两种实用的接收器架构，即分离式与集成式信息和能量接收器。集成式接收器集成了分离式接收器的前端组件，从而实现了更小的尺寸。这两种架构的速率 - 能量权衡由一个所谓的速率 - 能量（R - E）区域来表征。数值结果表明，当需要收集更多能量时，集成式接收器的R - E区域优于分离式接收器的R - E区域。
Simultaneous information and power transfer over the wireless channels potentially offers great convenience to mobile users. Yet practical receiver designs impose technical constraints on its hardware realization, as practical circuits for harvesting energy from radio signals are not yet able to decode the carried information directly. To make theoretical progress, we propose a general receiver operation, namely, dynamic power splitting (DPS), which splits the received signal with adjustable power for energy harvesting and for information decoding. Moreover, we propose two types of practical receiver architectures, namely, separated versus integrated information and energy receivers. The integrated receiver integrates the front-end components of the separated receiver, thus achieving a smaller form factor. The rate-energy tradeoff for these two architectures are characterized by a so-called rate-energy (R-E) region. Numerical results show that the R-E region of the integrated receiver is superior to that of the separated receiver when more harvested power is desired.