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On Optimal Resource Allocation for Hybrid VLC/RF Networks With Common Backhaul

机译:关于常见回程混合VLC / RF网络的最优资源分配

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摘要

The synergy between visible light communication (VLC) and radio frequency (RF) networks has attracted a considerable amount of attention due to the envisioned improvements compared to conventional systems, mainly in terms of data rate and coverage. In this paper, we investigate for the first time the coexistence of VLC and RF networks, assuming that both networks are served by a common backhaul network, as well as both perfect and imperfect channel state information (CSI). In this context, we propose an optimal resource allocation scheme that maximizes the corresponding data rate, while also taking into account the fairness among the involved users. This is of paramount importance because in such heterogeneous networks, a standard rate maximization approach yields a severely degraded performance for the weaker users. In order to provide a tractable solution to the formulated problem, which is non-convex, we transform this into an equivalent convex one. Moreover, a simplified power allocation problem is solved, which provides comparable results with substantially lower complexity. Finally, extensive simulations illustrate the validity and effectiveness of the proposed analysis, and provide valuable insights on the impact of the imperfect CSI on the overall network performance.
机译:由于与传统系统相比,可见光通信(VLC)和射频(RF)网络之间的协同作用引起了相当大的关注,主要是在数据速率和覆盖范围内。在本文中,我们首次调查VLC和RF网络的共存,假设两个网络都是通过共同的回程网络服务,以及完美和不完美的信道状态信息(CSI)。在这种情况下,我们提出了一种最佳的资源分配方案,可以最大化相应的数据速率,同时也考虑到所涉及的用户之间的公平性。这对重要性至关重要,因为在这种异构网络中,标准速率最大化方法会产生较弱的用户的严重劣化性能。为了向制定的问题提供一个非凸起的制定问题,我们将其转化为等效的凸起。此外,解决了简化的功率分配问题,其提供了具有显着较低的复杂性的可比结果。最后,广泛的模拟说明了所提出的分析的有效性和有效性,并提供有价值的见解对不完美CSI对整体网络性能的影响。

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