Physical-Layer Security Design for Distributed Detection with Attackers

• Main Authors: Shih-Ming Tseng, 曾士銘
• Other Authors: Wang Tsang-Yi
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/7f6pne

碩士 === 國立中山大學 === 通訊工程研究所 === 106 === Recently, due to the rise of smart home systems, the need for border battles and also with the low cost and convenience of sensors, the wireless sensing network becomes an indispensable system. However, since the sensor is exposed in the open space, the possibility of being attacked or malfunctioning is greatly increased. Furthermore, because sensors are less likely to be checked and repaired individually across different regions, the fusion center must have the ability to correctly judge information when the sensor has already been attacked. This thesis basically considers an under-attack wireless sensor network system. To reduce the system error rate, a new method is proposed. First, the likelihood ratio test is used to analyze the transmission signals of each sensor. Meanwhile, the transmission signals of other sensors are summed up and fusion center judges which signals were transmitted. The two transmission signals are then compared to check whether if they are matched. If both signals are identical, then determine the sensor as a legitimate sensor; otherwise, determine the sensor as an attacker. Finally, the fusion center only considers the transmission signal of the legitimate sensor and uses the majority decision to make the final decision.