Cooperative spectrum sensing method of low complexity

Abstract

The invention relates to a cooperative spectrum sensing method of low complexity, belonging to the technical field of wireless communication. Cognitive users participating in cooperative spectrum sensing sectionally decide the energy statistics of the sampling sequence of the signals sent from the authorized users so that the cognitive users send the state information of authorized user signals to a central unit according to the corresponding decision results, and the central unit fuses the state information to acquire the final detection result information of the authorized user signals. The method for calculating the statistics by increasing the sample quantity by all cognitive users participating in cooperative spectrum sensing, is obtained with the minimum computation complexity, has the advantages of same detection performance, good robustness, better feasibility and practicability, and can not be influenced by the environment easily.

Description

technical field [0001] The present invention relates to a method in the technical field of wireless communication, in particular to a low-complexity cooperative spectrum sensing method. Background technique [0002] In recent years, cognitive radio technology has developed rapidly as one of the best solutions to solve the contradiction between the shortage of spectrum resources and the insufficient utilization of allocated frequency bands. It uses spectrum sensing technology to enable cognitive users to access licensed frequency bands without causing interference to licensed users. Therefore, spectrum sensing is a key technology in cognitive radio systems. [0003] The energy detection method is developed by H.Urkowitz in the literature "Energy detection of unknown deterministic signals (energy detection of unknown deterministic signals)" (Proceedings of the IEEE, vol.55, no.4, pp.523-531, April 1967) proposed in. Its detection principle is based on the energy of the dete...

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Problems solved by technology

[0005] After searching the prior art, it was found that K.B.Letaief and W.Zhang wrote "Cooperative communications for cognitive radio networks (cooperative communication in cognitive radio networks)" (Proceedings of the IEEE, vol.97, no.5, pp. 878-893, May 2009) introduced in the centralized cooperative spectrum sensing based on hard-merging, when the number of cognitive users participating in cooperative spectrum sensing is fixed, the samples used by the cognitive users participating in cooperative spectrum sensing to calculate statistics The larger the number, the better the perceptual performance, and the higher the computational complexity

[0006] After searching, it was found that L.Bian and Q.Zhu published a paper titled "Cooperative spectrum sensing algorithm based on date" in "Proceedings of the fifth international conference on natural computation, vol. Fusion under bandwidth constraints (Cooperative Perception Algorithm Based on Data Fusion under Bandwidth Constraints)", which proposed a low-complexity cooperative perception method, but this method also reduced the performance of cooperative perception

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