Joint spectrum sensing method based on energy and eigenvalue variance

The invention discloses a joint spectrum sensing method based on energy and eigenvalue variance, and adopts a multi-stage joint spectrum sensing method in order to make full use of the advantages of different detection methods so as to enable the overall detection to be better. Considering that the method with higher complexity is high in detection precision and long in required time, detection is carried out in sequence from low to high according to the complexity of the method, so that the detection can be completed only through the method with low complexity under the condition of high signal-to-noise ratio, and the detection time is shortened. Wherein the first level is energy detection, and the second level is cyclostationary detection. When the signal-to-noise ratio is high, signal detection can be completed only by the first level, so that the sensing time in most signal-to-noise ratio ranges is far shorter than that in cyclostationary detection, or covariance absolute value detection is taken as the s