Backscattering assisted wireless-powered communication combines ultralow-power backscatter transmitters with energy harvesting devices. This paper investigates the transmission mode selection problem of a hybrid relay that forwards data by switching between the active wireless-powered transmission and the passive ambient backscattering. It first presents a hybrid relay system model and derives its end-to-end success probability under theoretically optimal, but practically unrealistic, conditions. The transmission mode selection is then formulated as a stochastic two-armed bandit problem in a varying environment where the distributions of rewards are nonstationary. The proposed model selection scheme does not assume to have access to any channel states or network conditions, but merely relies on learning from past transmission records. Numerical analyses are performed to validate the proposed bandit-based mode selection approach.

中文翻译：

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环境反向散射辅助无线供电中继模式选择的 Bandit 方法

反向散射辅助无线供电通信将超低功率反向散射发射器与能量收集设备相结合。本文研究了通过在有源无线供电传输和无源环境反向散射之间切换来转发数据的混合中继的传输模式选择问题。它首先提出了一个混合中继系统模型，并在理论上最佳但实际上不切实际的条件下推导出其端到端的成功概率。然后，传输模式选择被表述为在奖励分布非平稳的变化环境中的随机双臂老虎机问题。所提出的模型选择方案不假设可以访问任何信道状态或网络条件，而仅依赖于从过去的传输记录中学习。