Cooperative spectrum sensing method in cognitive radio system

Abstract

The invention relates to a cooperative frequency spectrum perception method in a cognition wireless system. An existing cooperative frequency spectrum perception method is unable to effectively resist attracts of malicious users. The method of the invention comprises: firstly conducting the energy detection to a main user signal by each user, sending the energy detection result to a control center, reading out the creditability of each user from a user creditability data pack, and obtaining the weight parameter of each user in the cooperative perception after the normalization treatment, and comparing the local perception result with a decision threshold of a system after multiplying the local perception result with the weight parameter of the related user, if the compared result is larger, meaning that a target frequency brand is currently used by the main user, or the target frequency brand is not currently used by the main user if smaller. The method of the invention has the simplicity and the practicability of a linear cooperative perception algorithm, overcomes the weaknesses of being unable to resist malicious node attacks in the existing method, and lightens the affects of the malicious nodes to the perception performance of the whole cognition wireless system.

Description

technical field [0001] The invention belongs to the technical field of cognitive radio, and relates to a method for multiple cognitive radio users to sense spectrum holes in a cooperative manner. Background technique [0002] In recent years, while the rapid development of wireless technology has brought many new services, the problem of wireless spectrum scarcity has also become more obvious. Since the realization of many new technologies needs to be based on spectrum resources, the scarcity of wireless spectrum has become an issue that affects the development of the communication industry. the bottleneck. The use and management of wireless spectrum resources have always been carried out by the government in a unified manner. At present, there are very few frequency bands that can be allocated. However, many studies have shown that in the wireless spectrum that has been allocated, the utilization rate of most frequency bands is lower than 25%, and the utilization rate of s...

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Problems solved by technology

[0012] The present invention aims at some problems of the existing cooperative spectrum sensing methods in the cognitive radio system, including that the cooperative sensing method based on the maximum ratio fusion algorithm and the optimal linear fusion algorithm cannot accurately estimate the real-time characteristics of the wireless sensing channel in practice, and based on equal gain fusion The cooperative sensing method of the algorithm does not fully consider the difference of user perception environment, and the existing cooperative spectrum sensing method cannot effectively resist malicious user attacks, etc., a linear fusion cooperative sensing method based on user credibility is proposed

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