Cognitive wireless network cooperation frequency spectrum detection method based on sensing node credibility
A cognitive wireless network and sensing node technology, which is applied in the field of collaborative spectrum detection based on the trust of sensing nodes, can solve the problems of not improving the spectrum sensing performance of the fusion center, deteriorating the spectrum sensing performance, and reducing the sensing accuracy. The impact of sporadic errors on spectrum detection, the effect of saving network system overhead and improving detection performance
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[0033] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.
[0034] like figure 1 , in a cognitive wireless network system including at least one primary user, N cognitive users and a fusion center, the cognitive user detects the surrounding spectrum environment, and there are two detection results: 1. The spectrum of the detection segment in the network Busy, the primary user is using the spectrum; 2. The spectrum of the detection segment in the network is idle, and the primary user is not using the spectrum.
[0035] The sensing node i uses an energy detection algorithm (actually any single-node spectrum detection method can be used, such as matched filter detection, cyclostationary detection, eigenvalue detection, etc.) to the received signal x i Whether there is a primary user signal s(t) in (t), perform hypothesis testing to obtain the local detection result d i . If the primary user signal s(t) ex...
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