Multi-frequency-band cooperative cognition spectrum sensing method

Abstract

The invention relates to a multi-frequency-band cooperative cognition spectrum sensing method. Secondary users respectively send signal to noise ratios, confidences, business requirements, and spectrum detection results of multiple primary users to a spectrum sensing fusion center, primarily-selected cooperative secondary users are calculated and screened via the spectrum sensing fusion center, and the quantity of frequency bands are then distributed to the primarily-selected cooperative secondary users; the root-mean-square values of the signal to noise ratios of all the primarily-selected secondary users and the quotients between the signal to noise ratios of the primarily-selected secondary users are calculated, checked secondary users participating in cooperation are selected according to the relation between the quotients and a preset threshold of the signal to noise ratio, and the detection probability of the checked secondary users is adjusted; and with the combination of the signal to noise ratios of the checked secondary users and the adjusted average detection probability, the step of selecting the checked secondary users is returned again, final secondary users participating in cooperation are eventually obtained, the global detection probability of a weighted OR criterion cooperation is regarded as the final detection result of the spectrum sensing fusion center, and bad influences of the secondary users with low signal to noise ratio or poor performance on the whole detection performance are avoided.

Description

technical field [0001] The invention relates to the field of spectrum detection, in particular to a multi-band cooperative cognitive spectrum sensing method. Background technique [0002] With the continuous development of wireless communication technology, emerging technologies marked by LTE, Wi-Fi, satellite communication and collaborative communication have emerged one after another, emerging in endlessly. These communication technologies put forward higher demands on wireless spectrum resources, thus making the spectrum resources more tense, and cognitive radio technology (CognitiveRadio, CR) emerges under this background. [0003] The basic approach of cognitive radio is that first, the secondary user (or cognitive user, cognitive user) uses spectrum sensing to continuously detect the authorized spectrum resources in the surrounding environment; Under the condition that the frequency spectrum is occupied and the transmission performance is almost unaffected, the second...

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Problems solved by technology

[0005] However, most of the existing cooperative spectrum sensing methods are only for single-band sensing. In order to improve spectrum utilization, multi-band cooperative sensing methods have become a new research hotspot.

However, in multi-band cooperative sensing, since the detection performance and signal-to-noise ratio of each user are not completely excellent, when all secondary users participate in multi-band cooperative sensing, the low signal-to-noise ratio or detection performance Poor secondary users can have a bad impact on overall detection performance

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