Soft-decision cooperative spectrum sensing data fusion method in mobile context

Abstract

The invention discloses a soft-decision cooperative spectrum sensing data fusion method in a mobile context and relates to the technical field of information and communication. The soft-decision cooperative spectrum sensing data fusion method solves problems, of a conventional soft-decision cooperative spectrum sensing data fusion method, that it is difficult for the conventional fusion method to be suitable for the mobile context, that the conventional soft-decision data fusion method depends on the signal-to-noise ratio of a cognitive user and the prior knowledge of a position; and that the conventional fusion method is poor in channel adaptability. The soft-decision cooperative spectrum sensing data fusion method comprises that each mobile cognitive user independently detects the local energy and uploads detection results to a fusion center; the fusion center computes a weight factor corresponding to the current fusion for each user just according to the detection results; and the fusion center solves a weighted objective function by using the detection results and the corresponding weighted factors and gives a final decision. The soft-decision cooperative spectrum sensing data fusion method is suitable for cognitive radio soft-decision cooperative spectrum sensing in information and communication technology.

Description

technical field [0001] The invention relates to the technical field of information and communication. Background technique [0002] In recent years, the rapid development of wireless communication technology has led to a sharp increase in the demand for wireless spectrum resources. However, the current fixed spectrum allocation policy makes most of the frequency bands not fully utilized. In order to improve spectrum utilization, researchers have proposed cognitive radio (CR) technology. CR is to allow the wireless communication equipment with radio environment awareness function to dynamically access the authorized frequency band of the main user without affecting the authorized frequency band of the main user signal, that is, the frequency band fixedly allocated to the user, and to communicate normally, so as to complete the allocation of spectrum resources. shared. In this process, spectrum sensing is a key technology to ensure the normal communication of primary user s...

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Problems solved by technology

[0008] The present invention is to solve the following problems in the existing soft-decision cooperative spectrum sensing data fusion method: 1), the existing fusion method is difficult to apply to the mobile scene; 2), the existing soft-decision data fusion method needs to rely on cognitive users 3) The channel adaptability of existing fusion methods is weak; thus providing a soft-decision cooperative spectrum sensing fusion method in mobile scenarios

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