Selecting type cooperation spectrum sensing method based on double-threshold energy detection

Abstract

The invention discloses a selecting type cooperation spectrum sensing method based on double-threshold energy detection. The selecting type cooperation spectrum sensing method comprises the following steps: (1) in a master user signal detection stage, adopting a double-threshold energy detection method by various cognitive users in a cognitive radio system to carry out local spectrum sensing, if an energy value exceeds two thresholds, carrying out local judgment 'H0 or H1'by the cognitive users, and if the energy value is between the two thresholds, reserving the energy value as a primary energy detection value by the cognitive users; (2) in an initial detection result reporting stage, evenly distributing a master user frequency band by the cognitive users, adopting a selecting type strategy by the cognitive users to report initial detection results respectively to a fusion center, preventing cognitive detection results with unreliable parameters from being introduced, meanwhile, saving traditional exclusive control channel resources, adopting the equal gain criterion by the fusion center to carry out master user judgment on the received primary energy detection value, allowing the judgment result to be equivalent to a node strategy by the fusion center, and then adopting the 'or' criterion by the fusion center to make the final judgment whether a master user exists. The simulation results show that according to the selecting type cooperation spectrum sensing method based on the double-threshold energy detection, and on the premise that ROC properties are not lost, the exclusive control channel resources are effectively saved, and meanwhile higher detection efficiency can be obtained.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, relates to a spectrum sensing method, in particular to a selective cooperative spectrum sensing method based on double-threshold energy detection. Background technique [0002] With the continuous growth of wireless communication services, the demand for spectrum resources of wireless communication systems continues to increase, so that wireless spectrum resources become increasingly scarce. However, wireless spectrum resources are non-renewable resources and can only be reused. Therefore, research on how to improve the utilization of spectrum resources can alleviate the problem of scarcity of spectrum resources. As an emerging intelligent wireless communication technology, cognitive radio technology breaks through the traditional policy of fixed spectrum allocation. By monitoring the target frequency band in real time, it allows cognitive users to "wait for an opportunity" to conn...

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Document "Cooperative spectrum sensing in cognitive radio, Part I: Two user networks, G.Ganesan and Y.G.Li, IEEE Transactions on Wireless Communications, 2007, 6(6 ):2204-2213) pointed out that in the traditional cooperative spectrum sensing scheme, it is generally assume

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