Game-Theoretic Spectrum Trading in RF Relay-Assisted Free-Space Optical Communications
Game-Theoretic Spectrum Trading in RF Relay-Assisted Free-Space Optical Communications
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DOI：
10.1109/twc.2019.2929387
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发表时间：
2018-06
影响因子：
10.4
通讯作者：
Shenjie Huang;V. Shah-Mansouri;M. Safari
中科院分区：
文献类型：
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作者：
Shenjie Huang;V. Shah-Mansouri;M. Safari
自由空间光 (FSO) 通信提供具有高数据速率和低系统复杂性的无线连接；然而，它却受到罕见的恶劣天气条件的影响。本文提出了一种基于博弈论频谱交易过程的新型混合 RF/FSO 系统，以增强 FSO 链路的可靠性。所提出的系统被认为具有频谱效率和功率效率。假设没有 RF 频谱预先分配给 FSO 链路，并且仅当链路可用性因罕见的恶劣天气条件（即雾等）而严重受损时，源方可以从周围 RF 节点之一借用一部分许可 RF 频谱。为源节点和射频节点之间的频谱交易提出了基于市场均衡的定价流程。通过使用租用频谱，源端能够建立双跳 RF/FSO 混合链路，以维持其到目的地的吞吐量。我们广泛的性能分析说明了所提出的通信系统的有效性。结果表明，所提出的方案可以显着提高系统的平均容量，特别是当周围射频节点流量负载较低时。此外，该系统还受益于通过多样性的方式让更多的射频节点参与频谱交易过程。最后，基于英国爱丁堡市的天气统计数据展示了所提出的系统在实际场景中的应用，这表明该系统可以显着提高链路可用性以满足运营商级要求。
Free-space optical (FSO) communication offers wireless connectivity with high data rates and low system complexity; however, it suffers from the infrequent adverse weather conditions. This paper proposes a novel hybrid RF/FSO system based on a game theoretic spectrum trading process to enhance the reliability of FSO links. The proposed system is considered to be both spectrum- and power-efficient. It is assumed that no RF spectrum is preallocated to the FSO link and only when the link availability is severely impaired by the infrequent adverse weather conditions, i.e., fog, and so on, the source can borrow a portion of licensed RF spectrum from one of the surrounding RF nodes. A market-equilibrium-based pricing process is proposed for the spectrum trading between the source and RF nodes. By using the leased spectrum, the source is able to establish a dual-hop RF/FSO hybrid link to maintain its throughput to the destination. Our extensive performance analysis illustrates the effectiveness of the proposed communication system. It is demonstrated that the proposed scheme can significantly improve the average capacity of the system, especially when the surrounding RF nodes are with low traffic loads. In addition, the system benefits from involving more RF nodes into the spectrum trading process by means of diversity. Finally, the application of the proposed system in a realistic scenario is presented based on the weather statistics in the city of Edinburgh, U.K., which demonstrates that the system can substantially enhance the link availability toward the carrier-class requirement.