Cooperative spectrum sensing method based on H infinity filter theory for cognition of wireless network

A cognitive wireless network and cooperative spectrum sensing technology, which is applied in the direction of communication channel monitoring, etc., can solve problems such as the impact of spectrum sensing performance

Active Publication Date: 2015-02-11
LIAONING UNIVERSITY
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Problems solved by technology

[0004] Although existing cooperative spectrum sensing methods can achieve spectrum detection in a certain ...

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  • Cooperative spectrum sensing method based on H infinity filter theory for cognition of wireless network
  • Cooperative spectrum sensing method based on H infinity filter theory for cognition of wireless network
  • Cooperative spectrum sensing method based on H infinity filter theory for cognition of wireless network

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Embodiment Construction

[0040] The specific implementation process of the present invention will be described in detail below in conjunction with the accompanying drawings and specific examples.

[0041] (1) if figure 1 As shown in the figure, cognitive users in a cognitive wireless network receive wireless signals in a certain frequency band through antennas. Therefore, the baseband equivalent discrete-time received signal corresponding to the rth cognitive user can be expressed as

[0042] x r [n]=s[n]+v r[n],n=1,2,...,M;

[0043] In the formula, s[n] represents the wireless signal sampling value transmitted by the authorized user through the channel, v r [n] represents the corresponding noise sampling value, and M is the number of sampling points of the received signal;

[0044] For each cognitive user, calculate the corresponding power spectrum estimate X of the received signal r [n];

[0045] X r [ n ] = ...

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Abstract

The invention relates to a cooperative spectrum sensing method based on an H infinity filter theory for cognition of a wireless network. The cooperative spectrum sensing method comprises the following steps of detecting the local spectrum for cognition users, and sending the sensing data and the local sensing results to a data integration center; enabling the data integration center to build a state space model of channel gain according to the sensing data sent by each cognition user, and using an H infinity filter method to evaluate the change condition of channel shade fading gain corresponding to each cognition user; calculating the testing statistic amount by the evaluation value of the channel shade fading gain corresponding to each cognition user; comparing the testing statistic amount with the setting threshold value, and determining which cognition user has a Byzantine type network attack activity; deleting the user data and the local sensing result of the cognition user with the attack activity from the data integration center; enabling the data integration center or using an integration criteria to perform decision integration on the local spectrum sensing result of the cognition user, so as to obtain the cooperative spectrum sensing result. The cooperative spectrum sensing method has the advantage that the cooperated spectrum sensing on the authorized users is well realized.

Description

technical field [0001] The invention relates to a cooperative spectrum sensing method applied in a cognitive wireless network. The method is based on the H infinite filter theory, which can not only realize spectrum detection for authorized users, but also effectively identify and eliminate Byzantine attacks in cognitive users . Background technique [0002] With the extensive research on cognitive radio technology by scholars around the world, cognitive wireless communication network will gradually become the main direction of future communication technology development because of its intelligent and efficient use of spectrum resources. In order to intelligently and efficiently allocate increasingly tight spectrum resources for wireless communication devices and new communication services, cognitive users in cognitive wireless networks must be able to cooperatively perform spectrum sensing on wireless communication systems to find free channels. Therefore, cooperative spec...

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Application Information

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IPC IPC(8): H04B17/30
Inventor 景源马利马技李鹏杨晓峰李皓宇牛斌
Owner LIAONING UNIVERSITY
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