Half-blindness collaborative spectrum sensing method with reliable false-alarm performance

Abstract

The invention relates to a half-blindness collaborative spectrum sensing method with reliable false-alarm performance. The method is used for constructing statistical decision amount by utilizing all characteristic values of a sample covariance matrix, and comprises the following steps: firstly, sampling a signal of a collaborative sensing node so as to form a received signal data vector; then calculating the sample covariance matrix of the received signal by utilizing the received signal data vector, and calculating all the characteristic values of the matrix; then constructing the statistical decision amount by utilizing the obtained characteristic values, and calculating the sensing decision threshold based on a simple closed expression; and finally, implementing multi-node collaborative sensing decision, wherein when the statistical decision amount is greater than the set threshold value, a master user signal exists, otherwise, when the statistical decision amount is less than the threshold value, the master user signal does not exist. The method provided by the invention can be used for achieving half-blindness detection under the condition of being lack of the master user signal and the statistical information of a wireless channel, and good detection performance is shown at the application occasions of the low signal to noise ratio, relatively weak relevance between received signal samples and the like.

Description

technical field [0001] The invention relates to a spectrum sensing method applied in a cognitive radio system, and belongs to the technical field of cognitive radio in wireless communication. Background technique [0002] Cognitive radio technology provides a feasible method to alleviate the contradiction between the scarcity of spectrum resources and the increasing demand for spectrum, so this technology has attracted extensive attention from industry and academia since its appearance. The core idea is that cognitive users can opportunistically use the authorized frequency band of the primary user without affecting the communication quality of the primary user, which is the so-called spectrum hole. In this context, designing a spectrum sensing method with good performance to effectively detect spectrum holes naturally becomes a key issue. [0003] Due to the existence of factors such as shadow fading, hidden terminals, primary users and unknown channel information, the des...

AI Technical Summary

Problems solved by technology

However, the above two methods also have some common problems: First, the false alarm performance is unstable

Second, the calculation of the perceptual decision threshold is complex

The determination of the theoretical decision threshold of the above two methods involves the solution of the Tracy-Widom distribution, and the calculati

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