Dynamic-adjusting-based multi-frequency-range cooperated frequency spectrum sensing method

Abstract

The invention relates to a dynamic-adjusting-based multi-frequency-range cooperated frequency spectrum sensing method. A frequency spectrum sensing decision-making center carries out screening on frequency spectrum detection results of a plurality of main users to select cooperative slave users preliminarily according to a preset signal-to-noise-ratio threshold value as well as signal-to-noise ratios, confidence coefficients, and service demands of all slave users; and quotient and quotient threshold relations between signal-to-noise-ratio root-mean-square values and signal-to-noise ratios of all slave users selected preliminarily are calculated and determined and slave users for participating in cooperation are selected, an optimal energy determination threshold value is obtained adaptively, a frequency spectrum sensing error function based on the number of slave users selected preliminarily is established, and optimal cooperation slave users are determined by using the number, which is obtained when a minimum value of the frequency spectrum sensing error function is obtained, of the slave users selected preliminarily as the optimal cooperative slave user number for cooperative sensing, and thus a final result of the multi-frequency-range cooperated frequency spectrum sensing is completed. Therefore, with the method, an optimal determination threshold value in a receiving signal energy changing state is obtained adaptively and the optimal cooperative slave number can also be obtained, so that the cooperative sensing complexity is reduced.

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 (CognitiveRadio, 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 u...

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

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