关于基于混合RF/FSO系统与不可信赖继电器的SWIPT多用户干扰的安全性能
Xingyue Guo1, Shan Tu2, Dexian Yan1
1Key Laboratory of Electromagnetic Wave Information Technology and Metrology of Zhejiang Province, College of Information Engineering, China Jiliang University, Hangzhou 310018, China.
Sensors (Basel, Switzerland)
|January 8, 2025
概括
这项研究提高了无线安全使用人工噪声混合无线频/自由空间光学 (RF/FSO) 系统与不可靠的继电器. 像信号干扰比率这样的关键因素提高了安全性能,特别是在低射频信号噪声比率的情况下.
科学领域:
- 无线通信安全 无线通信安全
- 光学无线通信的无线通信
- 信息理论 信息理论
背景情况:
- 不值得信赖的继电器在多用户无线网络中构成重大安全风险.
- 同时无线信息和电力传输 (SWIPT) 对于供电用户节点至关重要.
- 混合射频 (RF) 和自由空间光学 (FSO) 系统提供了增强的通信能力.
研究的目的:
- 分析混合RF/FSO系统的安全性能,采用SWIPT与不可信赖的继电器.
- 导出密度中断概率 (SOP) 和平均密度容量 (ASC) 的封闭式表达式.
- 调查人工噪音和系统参数对安全的影响.
主要方法:
- 模拟带有Nakagami-m色的射频频道和带有马拉加 (M) 流的FSO频道.
- 使用人工噪音实施基于干扰的安全策略.
- 导出SOP和ASC的封闭式表达式.
- 通过蒙特卡洛模拟验证结果.
主要成果:
- 对SOP和ASC的封闭式表达式成功导出和验证.
- 安全性能随着信号干扰噪音比率的增加和干扰用户而显著提高.
- 通过更高的时间分布因子和能量转换效率,可以观察到更高的安全性.
- 低射频信号噪声比 (SNR) 条件最受益于这些安全增强.
结论:
- 拟议的人工噪声策略有效地减轻了混合射频/FSO系统中不可信赖的继电器对安全的威胁.
- 系统参数如SNR,用户数量和能源效率极大地影响安全结果.
- 这项研究为设计安全高效的无线通信系统提供了宝贵的见解.
相关概念视频
01:27Line Protection with Impedance Relays
65
Coordinating time-delay overcurrent relays in complex radial systems and directional overcurrent relays in multi-source transmission loops can be challenging. Impedance relays address these issues by responding to the voltage-to-current ratio, specifically measuring the apparent impedance of a line. These relays become more sensitive during faults as current increases and voltage decreases, thereby reducing the apparent impedance.
Under normal conditions, low load currents keep the measured...
Under normal conditions, low load currents keep the measured...
65
01:20Differential Relays
104
Differential relays are used to protect generators, buses, and transformers by comparing electrical quantities at different points. When a fault occurs, the difference in current between the two points triggers the relay to operate, opening the circuit breaker. Under normal conditions, the current entering (i1) and leaving (i2) a generator are equal. When a fault occurs, however, these currents become unequal, and the difference current flows in the relay operating coil, causing the relay to...
104
01:21Pilot and Numeric Relaying
77
Pilot relaying is a type of differential protection used in power systems. It compares electrical quantities at the terminals of equipment via a communication channel instead of direct relay interconnection. This method is essential for transmission lines where the terminals are far apart, typically up to 80 km for lines with 69 to 115 kV ratings. Four types of communication channels are used for pilot relaying:
77
01:23Radial System Protection
89
Radial systems employ time-delay overcurrent relays to reduce load interruptions. When a fault occurs, the nearest breaker opens first, while upstream breakers remain closed due to longer delay settings. This approach ensures minimal disruption to the rest of the system.
In a radial system with a fault downstream of the third breaker, ideally, only the third breaker will open, isolating the fault and interrupting the load connected beyond it. The second breaker has a longer delay setting,...
In a radial system with a fault downstream of the third breaker, ideally, only the third breaker will open, isolating the fault and interrupting the load connected beyond it. The second breaker has a longer delay setting,...
89
01:26Overcurrent Relays
68
Overcurrent relays, crucial for circuit protection, are connected to the secondary current of a current transformer. There are two primary types of overcurrent relays: instantaneous and time-delay.
Instantaneous overcurrent relays activate immediately when the input current exceeds a predetermined value, known as the pickup current, instantly energizing the circuit breaker trip coil. This rapid response is vital for addressing severe faults quickly.
Time-delay overcurrent relays, on the other...
Instantaneous overcurrent relays activate immediately when the input current exceeds a predetermined value, known as the pickup current, instantly energizing the circuit breaker trip coil. This rapid response is vital for addressing severe faults quickly.
Time-delay overcurrent relays, on the other...
68
01:25Directional Relays
91
Directional relays, essential for managing unidirectional fault currents, enhance the safety and efficiency of power systems. On power lines equipped with directional relays, faults downstream (to the right) of the current transformer typically cause the fault current to lag the bus voltage by approximately 90 degrees, known as the forward direction. In contrast, upstream (left-side) faults may result in the fault current leading the bus voltage by nearly 90 degrees, termed the reverse...
91