Wireless-Powered Device-to-Device Communications With Ambient Backscattering: Performance Modeling and Analysis
Wireless-Powered Device-to-Device Communications With Ambient Backscattering: Performance Modeling and Analysis
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DOI：
10.1109/twc.2017.2779857
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发表时间：
2018-03-01
影响因子：
10.4
通讯作者：
Han, Zhu
中科院分区：
文献类型：
--
作者：
Lu, Xiao;Jiang, Hai;Han, Zhu
最近先进的无线能量收集技术使无线供电通信能够以自我可持续的方式提供无线数据服务。然而，无线供电通信依赖有源射频信号进行通信，导致功耗较高。另一方面，环境反向散射技术被动反射空气中现有的射频信号源进行通信，有可能促进超低功耗的实现。在本文中，我们通过将环境反向散射与无线供电通信相集成，引入了一种混合设备到设备（D2D）通信范例。混合 D2D 通信是自我可持续的，因为不需要专用的外部电源。然而，由于用于能量收集和反向散射的无线电信号来自周围环境，因此混合D2D通信的性能在很大程度上取决于环境因素，例如周围能源的分布、空间密度和传输负载。因此，我们为混合D2D发射机设计了两种模式选择协议，允许更灵活地适应环境。然后，我们引入分析模型来表征所考虑的环境因素对混合 D2D 通信性能的影响。结合广泛的模拟，我们的分析表明，通信性能受益于较大的斥力、传输负载和环境能源密度。此外，我们研究了不同的模式选择机制如何影响通信性能。
The recent advanced wireless energy harvesting technology has enabled wireless-powered communications to accommodate wireless data services in a self-sustainable manner. However, wireless-powered communications rely on active RF signals to communicate and result in high power consumption. On the other hand, ambient backscatter technology that passively reflects existing RF signal sources in the air to communicate has the potential to facilitate an implementation with ultra-low power consumption. In this paper, we introduce a hybrid device-to-device (D2D) communication paradigm by integrating ambient backscattering with wireless-powered communications. The hybrid D2D communications are self-sustainable, as no dedicated external power supply is required. However, since the radio signals for energy harvesting and for backscattering come from the ambient, the performance of the hybrid D2D communications depends largely on environment factors, e.g., distribution, spatial density, and transmission load of ambient energy sources. Therefore, we design two mode selection protocols for the hybrid D2D transmitter, allowing a more flexible adaptation to the environment. We then introduce analytical models to characterize the impacts of the considered environment factors on the hybrid D2D communication performance. Together with extensive simulations, our analysis shows that the communication performance benefits from larger repulsion, transmission load, and density of ambient energy sources. Furthermore, we investigate how different mode selection mechanisms affect the communication performance.