Spectrum sensing method, system and medium based on random forest algorithm
A random forest algorithm and spectrum sensing technology, applied in the transmission system, transmission monitoring, advanced technology, etc., can solve the problems that cannot meet the diverse development needs of the communication field, achieve accurate spectrum sensing, and reduce time costs
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[0051] The present invention studies a spectrum sensing algorithm based on random forest. The algorithm uses the high-order cumulant to form the characteristics of the sensing signal, as the basis for judging the existence of the main user and the modulation mode of the main user signal, and uses the C4.5 algorithm to train to form a random signal. The forest classifier overcomes the overfitting problem caused by the single classifier of the decision tree algorithm.
[0052] Specific implementation steps:
[0053] Step 1: Convert the signal training data set into a high-order cumulant feature sample set according to the high-order cumulant calculation formula.
[0054] The formula for calculating the higher-order cumulant is as follows:
[0055] C 20 =cum(s[n],s[n])=M 20
[0056] C 21 =cum(s[n],s * [n])=M 21
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[0058] C 41 =cum(s[n],s[n],s[n],s * [n])=M 41 -3M 20 M 21
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[0065] The ch...
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