A vehicle network cognitive radio adaptive spectrum sensing method

Abstract

The present invention relates to a vehicle network cognitive radio adaptive spectrum sensing method. The method comprises the steps of: establishing a cognitive vehicle network consisting of a spectrum sensing fusion center, cognitive vehicles and an authorized user; according to energy detection results and signal-to-noise ratios sent by the cognitive vehicles and a preset signal-to-noise ratio choosing value, selecting members of a primary cognitive group participating in cooperation, and calculating a normalized quotient value corresponding to the signal-to-noise ratio of each member in the primary cognitive group; acquiring a signal-to-noise ratio preset threshold, a signal-to-noise ratio optimal threshold and a joint screening parameter value of each of the primary cognitive vehicles, and selecting secondary cognitive vehicles participating in cooperation; and finally, performing an adaptive sensing fusion by the spectrum sensing fusion center according to the spectrum sensing results from the secondary cognitive vehicles, acquiring an optimal energy judgment threshold value adapted to the energy variation of the received signal under a moving state of the cognitive vehicles, and selecting optimal cooperative ultimate cognitive vehicles for cooperative sensing. According to the invention, the number of the optimal cooperative ultimate cognitive vehicles is obtained when the minimum spectrum detection error is ensured, so that the cooperative detection complexity is reduced.

Description

technical field [0001] The invention relates to the field of the Internet of Vehicles, in particular to a method for adaptive spectrum sensing of a cognitive radio of the Internet of Vehicles. Background technique [0002] The Internet of Vehicles is based on the intra-vehicle network, the inter-vehicle network, and the in-vehicle mobile Internet. It is a system network for data communication and information exchange between vehicles or between vehicles and people in accordance with pre-agreed protocols and interaction standards. It is an integrated network that can realize vehicle intelligent monitoring and intelligent traffic management, a typical application of Internet of Things technology in the field of transportation systems, and an important factor for the realization of the national "One Belt, One Road" major strategy. [0003] In existing vehicles, with the continuous installation of various wireless communication devices in vehicles, most vehicles equipped with co...

AI Technical Summary

Problems solved by technology

Therefore, the existing cooperative spectrum sensing method in the cognitive wireless network of the Internet of Vehicles cannot meet the actual sensing needs of cognitive vehicles, nor can it accurately realize spectrum sensing.

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