Covert Communication in Relay-Assisted IoT Systems
Covert Communication in Relay-Assisted IoT Systems
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DOI：
10.1109/jiot.2021.3051694
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发表时间：
2021-04-15
影响因子：
10.6
通讯作者：
Fukushi, Masaru
中科院分区：
文献类型：
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作者：
Gao, Chan;Yang, Bin;Fukushi, Masaru
物联网（IoT）系统对于为智慧城市提供无处不在的无线连接至关重要。然而，由于无线信道的广播性和开放性，这样的系统正面临着安全挑战。本文研究了由源-目的地对、被动看守和多个中继组成的场景下的隐蔽通信性能。首先提出了两种中继选择方案，一种是随机选择，另一种是上级链路选择。基于这两个方案，我们研究了源的传输策略设计，从而定义了源可以传输隐蔽消息的必要条件。我们进一步推导了基于两种中继选择方案的监狱长和隐蔽容量的检测错误概率，并通过有效的数值搜索来探索隐蔽容量的最大化。最后，数值结果来说明我们的理论研究结果和性能的隐蔽通信在这样的系统。在源端相同的传输功率下，最大隐蔽容量性能，最优链路选择方案比随机选择方案提高了108%。
Internet of Things (IoT) systems are of paramount importance to provide ubiquitous wireless connectivity for smart cities. However, such systems are facing security challenges due to the broadcast and openness nature of wireless channels. This article studies the performance of covert communication under a scenario consisted of a source-destination pair, a passive warden, and multiple relays. We first propose two relay selection schemes, one is random selection and another is superior-link selection. Based on these two schemes, we then examine the transmission strategy design for the source and thus define the necessary condition that the source can transmit covert messages. We further derive the detection error probability of warden and covert capacity based on two relay selection schemes and also explore the covert capacity maximization through efficient numerical searches. Finally, numerical results are provided to illustrate our theoretical findings and the performance of covert communication in such systems. Remarkably, the superior-link selection scheme has 108% improved to the random selection scheme for the maximum covert capacity performance under the same transmission power at the source.