A cooperative spectrum sensing method capable of eliminating malicious mobile terminals in an air-space-ground integrated network
A mobile terminal and spectrum sensing technology, which is applied in the field of collaborative spectrum sensing, can solve the problems of excessive punishment and inability to accurately eliminate reliable users
Active Publication Date: 2017-10-03
HARBIN INST OF TECH
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[0007] The present invention aims to solve the problem that the existing spectrum sensing method cannot accurately eliminate malicious users in the cognitive network while retaining reliable users, and always over-punishes reliable users in deep fading or with large path loss, thereby providing a Cooperative Spectrum Sensing Method for Eliminating Malicious Mobile Terminals in Air-Space-Ground Integrated Network
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specific Embodiment approach 1
[0048] Specific implementation mode 1. A cooperative spectrum sensing method capable of eliminating malicious mobile terminals in an air-space-ground integrated network is implemented by the following steps:
[0049] Step 1: Set cognitive user u i Initial value of trust r i =0.
[0050] Step 2: Each cognitive user performs energy detection independently, and sends the detected energy value and the cell number of its current cell to the fusion center.
[0051] Step 3. Use all the detection results uploaded in step 2, that is, the detection results obtained in the k-th perception cycle, and the detection results of the first 1-1 detection cycles stored at the fusion center to form the detection result set Y . Y={Y 1,k-(l-1) ,Y 1,k-(l-2) ,...,Y 1,k ,Y 2,k-(l-1) ,Y 2,k-(l-2) ,...,Y 2,k ,...,Y N,k-(l-1) ,Y N,k-(l-2) ,...Y N,k }. Expressed in cell c j Cognitive users in u i The energy value detected at the kth time.
[0052] Step 4: According to formula (1), calculate the N×l distance f...
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A cooperative spectrum sensing method capable of eliminating malicious mobile terminals in an air-space-ground integrated network relates to the field of information and communication technology. The present invention aims to solve the problem of malicious attacks by malicious mobile terminals that may exist on the ground part of an air-space-ground integrated network. The present invention utilizes the concept of trustworthiness, first divides the researched network area into several cells, and then compares the local detection results of each mobile cognitive user with the detection results of most users in the cell in each cell The size of the gap is used as a basis to update the trust value of each cognitive user, and the preset threshold is used to determine whether the user is a malicious user, and then all the detection results of the malicious user are eliminated. Finally, only the local detection results of each cognitive user are used to calculate and assign appropriate weights to each detection result, so that the detection probability of the whole system increases and the false alarm probability remains unchanged. The invention is applicable to the spectrum sensing in the space-space-ground integrated network.
Description
Technical field [0001] The present invention relates to the field of information and communication technology, in particular to a cooperative spectrum sensing method in an air-space-ground integrated network. Background technique [0002] At present, terrestrial networks basically have relatively stable network infrastructure. Network units and terminal equipment are interconnected through physical transmission technologies such as optical fiber, Ethernet, and wireless networks. The backbone nodes and links have relatively short fixed transmission delays, and Changes in link time and space are small. However, the space network is dynamically networked by various aerospace and flight devices, with long transmission distances (up to tens of thousands of kilometers), high dynamic nodes (speeds of several hundred m / s to several thousand m / s), and link time and space scales With the characteristics of large changes, the traditional Internet networking mode and security protection tec...
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IPC IPC(8): H04B17/382
Inventor 贾敏王欣玉郭庆顾学迈刘晓锋王雪朱思宇陈子研杨健史瑶
Owner HARBIN INST OF TECH