Double threshold cooperative sensing method in cognitive wireless network

Abstract

The invention discloses a double threshold cooperative sensing method in a cognitive wireless network, comprising the following steps: 1. recovering a signal through local compressed sensing, and recovering the whole broadband frequency spectrum in the invention through the compressed sensing, thus a low-speed A / D commutator can be used, so as to lower the hardware requirement; 2. determining a sub frequency band, being capable of obtaining a frequency spectrum edge point of the recovered broadband frequency spectrum signal through the compressed sensing through a wavelet edge detection, and forming a plurality of sub frequency bands by segmenting the frequency spectrum; and 3. cooperative sensing: carrying out double threshold energy detection on all sub frequency bands by each cognitiveuser, transmitting the detection result to a fusion center for judgment to obtain the existing condition of the main user of the whole frequency spectrum, and self-adaptively determining the positionof the spectrum hole in the frequency band. Through the steps, the cognitive network can carry out sampling sensing on the main user signals under the condition of low nyquist frequency, and can self-adaptively determine the position of the spectrum hole in the frequency band.

Description

technical field [0001] The invention belongs to the technical field of cognitive radio, and more specifically, relates to a dual-threshold cooperative sensing method in a cognitive wireless network. Background technique [0002] With the development of Dynamic Spectrum Access (Dynamic Spectrum Access) in recent years, cognitive radio is committed to solving the problem of spectrum resource shortage from the perspective of spectrum allocation. Cognitive radio should be able to adaptively identify existing or potential spectrum holes in the surrounding environment, and use known spectrum holes without causing interference to main users. Cognitive radio is considered to be able to satisfy people Technologies that demand wideband spectrum. [0003] In theory, cognitive radio can consciously perceive the surrounding environment and use idle spectrum resources for communication. Therefore, cognitive radio has a high demand for spectrum sensing capabilities. However, the current...

AI Technical Summary

Problems solved by technology

However, the current spectrum sensing technology based on Shannon's theorem cannot meet the needs of applications in the broadband spectrum environment: on the one hand, it is becoming more and more difficult for the sampling rate to maintain or exceed the Nyquist sampling rate; on the other hand, based on Shannon's theorem, The sampling of is only to restore the signal, and the relevant information of the spectral hole information has not been processed

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