Passive cooperative spectrum sensing method in multi-user cognitive radio network

Abstract

The invention relates to a passive cooperative spectrum sensing method in multi-user cognitive radio network. According to the method, on the basis of spectrum detection based on energy, the cognitive communication mode of sensing first and communication later is converted into the mode of communication first and sensing service compensation later, the following problems in the communication process of cognitive radio are optimized: (1) the spectrum sensing time before communication of secondary user is eliminated, the spectrum sensing work is carried out after the communication is ended, the overall delay between 'requiring communication' and 'being capable of communication' is shortened, and the efficiency of spectrum detection is greatly improved; (2) the shortening of the overall delay is capable of further reducing the amount of master users appearing in the sensing time delay, and the interference with the master users is reduced; (3) only the secondary users in communication are required to carry out spectrum sensing and the secondary users in the whole network are not required to carry out sensing so that the network energy consumption is reduced; and (4) who senses who communicates accords with equity principle, no communication is avoided but the collision to the cognitive radio by sensing users is required.

Description

technical field [0001] The invention relates to a passive cooperative spectrum sensing method in a multi-user cognitive radio network, which belongs to the field of cognitive radio. Background technique [0002] With the development of wireless communication technology, the contradiction between communication performance and resource expenditure is becoming more and more prominent, the scarcity of spectrum resources and the inefficiency of static spectrum allocation strategies are becoming more and more obvious. As a new technology to improve spectrum utilization, cognitive radio become a research hotspot. [0003] "Cognitive radio" was first proposed by Dr. Jeseph Mito1a in 1999. It uses software radio as an extended platform and is a new intelligent wireless communication technology. It can perceive the surrounding wireless environment, and adjust transmission parameters in real time through understanding the environment and active learning to adapt to changes in the exte...

AI Technical Summary

Problems solved by technology

Due to the suddenness of transmission demand, in the absence of channel usage statistics, SU cannot select the best channel for detection, and can only randomly select channels, which increases the search delay for available channels, not only misses spectrum opportunities, but also may cause problems with conflict between PUs

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