Physical Layer Security in Untrusted Lossy Decode-and-Forward Relay Networks with Finite Blocklength
Physical Layer Security in Untrusted Lossy Decode-and-Forward Relay Networks with Finite Blocklength
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DOI：
10.1109/ccnc51644.2023.10060369
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发表时间：
2023-01
期刊：
影响因子：
--
通讯作者：
Shen Qian
中科院分区：
文献类型：
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作者：
Shen Qian
研究了有限块长条件下非可信中继网络的物理层安全性能。在不可信的中继处考虑有损解码转发(DF)中继。与传统的DF中继不同的是，即使在中继端检测到错误，中继器也总是将信息序列转发到目的地，这可以用来增强不可信任的中继网的安全性。根据短包通信的特点，提出并数值推导了用于评估非可信中继网络物理层安全性能的可靠安全概率。可靠和安全概率表示目的地能够恢复从源发送的原始消息的概率，而中继站不能。研究发现，在非可信中继网络中，只要信源和中继器的发射功率贡献平衡，短包通信就能保持一定的可靠安全概率。
This paper investigates the physical layer security performance of an untrusted relay network in the finite blocklength regime. Lossy decode-and-forward (DF) relaying is considered at the untrusted relay. Different from conventional DF relaying, the relay always forwards information sequences to the destination even if error is detected at the relay, which can be utilized to enhance the security of the untrusted relay network. Based on the characteristics of short-packet communications, the reliable-and-secure probability is proposed and numerically derived for evaluating the security performance in the physical layer of the untrusted relay network. Reliable-and-secure probability represents the probability that the destination can recover the original message sent from the source, whereas the relays cannot. It is found that as long as the contribution of the transmit power of source and relays is balanced, a certain degree of reliable-and-secure probability can be held for short-packet communications in the untrusted relay network.