Research on wireless spectrum sensing technology based on machine learning

Abstract

In this paper, based on the spectrum sensing problem of the primary user signal in low SNR environment, an improved random forest spectrum sensing algorithm is proposed by using the advantage of strong forest classifier. The algorithm uses the mean and variance of the signal cycle spectrum with the largest extraction energy at each cycle frequency as the characteristic parameter to generate the samples in the sample set; On the basis of this, some samples in the presence of the primary user are selected as positive samples, and some samples in the absence of the primary user are used as negative samples to realize the construction of random forests; Finally, the trained random forests are used to classify the detected signals to achieve effective perception of the primary user signals. Thereby improving the perceptual performance of the main user signal in the case of low signal to noise ratio. Thereby improving the perceptual performance of the main user signal in the case of low signal to noise ratio. The experimental results show that the proposed algorithm has strong classification detection effect, can achieve spectrum sensing of the main user signal better under low SNR, and is generally suitable for solving the spectrum sensing problem of primary user signal in low SNR environment.