Direct Wireless Link to Out-of-Range Node With Assistance of Surrounding Nodes
Direct Wireless Link to Out-of-Range Node With Assistance of Surrounding Nodes
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DOI：
10.1109/tvt.2019.2934502
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发表时间：
2019-09
影响因子：
6.8
通讯作者：
Hiroya Tanaka;Shintaro Hiraoka;Shintaro Arai;T. Yamazato;Y. Tadokoro
中科院分区：
文献类型：
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作者：
Hiroya Tanaka;Shintaro Hiraoka;Shintaro Arai;T. Yamazato;Y. Tadokoro
我们提出了一种方法，建立一个直接的无线链路从一个传输源到一个范围外的目的地与周围的通信节点的协助。在该方法中，通过利用从周围通信节点发送的干扰信号来放大弱（亚阈值）信号。为了评估放大增益，我们研究了多径衰落信道中的互信息。结果表明，干扰信号增强了互信息，该方法扩大了源节点的无线覆盖范围。为了理解增强机制，我们引入了一个玩具模型的传播信道和讨论的作用的干扰信号。我们发现干扰信号允许阈下信号进入信号空间的可检测区域。此外，互信息在干扰信号的最佳功率处被最大化。此外，信道容量的详细讨论表明，存在一个最佳的符号传输的先验概率。
We propose a method that establishes a direct wireless link from a transmission source to an out-of-range destination with the assistance of the surrounding communication nodes. In this method, a weak (subthreshold) signal is amplified by utilizing the interference signals transmitted from the surrounding communication nodes. To evaluate the amplification gain, we study the mutual information in a multipath fading channel. As a result, we reveal that the mutual information is enhanced owing to the interference signals, and the proposed method enlarges the radio coverage area of the source node. To understand the enhancement mechanism, we introduce a toy model of the propagation channel and discuss the role of the interference signals. We find that the interference signals allow the subthreshold signals into the detectable region in the signal space. Moreover, the mutual information is maximized at the optimal power of the interference signals. In addition, a detailed discussion of the channel capacity shows that there exists an optimal a priori probability of symbol transmission.