In this letter, we propose an opportunistic source selection based two-way cooperative ambient backscatter communication (CABC) system, in which two sources convey information to each other via a decode-and-forward enabled relay node and the tag embedded in the relay utilizes the power difference produced by the two hops to accomplish backscatter communication (BC) concurrently. The proposed system can achieve the bidirectional information flow for both the relaying transmission (RT) and BC at the same time. The analytical results of the outage probabilities for both RT and BC are derived. Numerical results verify the theoretical analysis and show that the proposed scheme can increase the throughput of the BC while maintaining the same power consumption and not degrading the performance of RT, compared to the existing one-way CABC system.

中文翻译：

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基于机会源选择的双向协作环境背向散射通信系统的停电性能分析

在这封信中，我们提出了一种基于机会源选择的双向协作环境背向散射通信（CABC）系统，其中两个源通过启用了解码和转发的中继节点相互传递信息，并且嵌入在中继中的标签利用了两跳产生的功率差同时完成反向散射通信（BC）。所提出的系统可以同时实现针对中继传输（RT）和BC的双向信息流。得出了RT和BC的中断概率的分析结果。数值结果验证了理论分析，并表明，与现有的单向CABC系统相比，该方案可以在保持相同功耗且不降低RT性能的情况下提高BC的吞吐量。