Multi-band Cooperative Spectrum Sensing Method Based on Dynamic Adjustment

Abstract

The invention relates to a multi-band cooperative spectrum sensing method based on dynamic adjustment. The spectrum sensing decision-making center is based on the preset signal-to-noise ratio threshold, each slave user's own signal-to-noise ratio, confidence level, service requirements, and the spectrum detection results of multiple master users. , to screen primary users for collaboration; calculate and judge the quotient value and quotient threshold relationship between the root mean square value of the signal-to-noise ratio of all primary users and the signal-to-noise ratios of each primary user, and select the secondary users participating in the collaboration, And adaptively obtain the optimal energy decision threshold value, establish a spectrum sensing error function based on the number of primary users, and use the number of primary users when the spectrum sensing error function obtains the minimum value as the optimal cooperative sensing user number , determine the best cooperative user, and then complete the final result of multi-band cooperative spectrum sensing. This method not only adaptively obtains the optimal decision threshold value under the energy fluctuation state of the received signal, but also obtains the optimal number of cooperative slave users, and reduces the complexity of cooperative perception.

Description

technical field [0001] The invention relates to the field of spectrum sensing, in particular to a dynamic adjustment-based multi-band cooperative spectrum sensing method. Background technique [0002] With the continuous development of wireless communication technology, emerging technologies marked by LTE, Wi-Fi and collaborative communication have emerged one after another. These communication technologies put forward higher demands on wireless spectrum resources, thus making the spectrum resources more tense, and cognitive radio technology (Cognitive Radio, CR) emerges under this background. [0003] The basic idea of ​​cognitive radio is that first, the user uses spectrum sensing to continuously detect the authorized spectrum resources in the surrounding environment; Adaptively adjust the transceiver equipment from the user, and adjust the transceiver equipment to the idle frequency spectrum for communication. When the secondary user perceives the signal of the primary ...

AI Technical Summary

Problems solved by technology

However, in the actual multi-band cooperative spectrum sensing, the signal energy received by each slave user is dynamically changing, not fixed, which will cause the preset fixed decision threshold in the existing method to fail. Ensure accurate perception from users, which seriously affects the overall cooperative perception performance of multiple users on multi-band

Images