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On the Deployment of Energy Sources in Wireless-Powered Cellular Networks

机译：无线蜂窝网络中的能源部署

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Wireless-powered cellular networks (WPCNs) are currently being investigated to ensure the reliability as well as improved battery lifetime of wireless devices. A WPCN leverages on a centralized base station (BS) that takes care of both wireless information and energy transfer. However, the harvested energy and, in turn, the spectral efficiency of uplink transmission of the users may significantly vary depending on the locations of the users and the channels used for energy and information transfer purposes. To this end, this paper theoretically characterizes the signal-to-noise ratio (SNR) outage zones in a WPCN and comparatively analyzes the performance of three useful configurations of dedicated energy sources that can potentially minimize the SNR outage zones. These configurations are: (i) harvesting energy from and information transfer to a full-duplex BS. This is considered as a baseline configuration; (ii) harvesting energy from symmetrically deployed power beacons (PBs) and information transfer to a conventional half-duplex BS; and (iii) harvesting energy from symmetrically deployed PBs that are colocated with the distributed antenna elements (DAEs) of a conventional half-duplex BS. For all the listed cases, we characterize the SNR outage probability and spectral efficiency of an arbitrarily located user within the cellular region. Based on the derived expressions, we also optimize the distance of the PBs from the BS to minimize the SNR outage probability and provide closed-form solutions for special cases. The optimum distance of the PBs is shown to be a function of the number of PBs and the coverage area of the BS. Numerical results validate the accuracy of the derived expressions, provide design insights related to WPCNs, and reveal the significance of the limited number of optimally placed PBs over a large number of randomly deployed PBs.
机译：当前正在研究无线蜂窝网络（WPCN），以确保无线设备的可靠性以及更长的电池寿命。 WPCN利用集中式基站（BS）来处理无线信息和能量传输。然而，取决于用户的位置以及用于能量和信息传输目的的信道，所收集的能量以及用户的上行链路传输的频谱效率可能显着变化。为此，本文从理论上描述了WPCN中的信噪比（SNR）中断区域，并比较了三种专用能源的有用配置的性能，这些配置可以潜在地将SNR中断区域最小化。这些配置是：（i）从全双工BS收集能量并向其传输信息。这被视为基准配置； （ii）从对称部署的功率信标（PB）收集能量，并将信息传输到常规的半双工BS； （iii）从与传统半双工BS的分布式天线元件（DAE）共置的对称部署的PB中获取能量。对于所有列出的情况，我们描述了蜂窝区域内任意位置的用户的SNR中断概率和频谱效率。基于导出的表达式，我们还优化了PB与BS的距离，以最大程度地降低SNR中断概率，并为特殊情况提供封闭形式的解决方案。 PB的最佳距离显示为PB数量和BS覆盖区域的函数。数值结果验证了导出表达式的准确性，提供了与WPCN相关的设计见解，并揭示了在大量随机部署的PB上有限数量的最佳放置PB的重要性。

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