Coalitional game based multi-user collaborative spectrum sensing method

Abstract

The invention discloses a coalitional game based multi-user collaborative spectrum sensing method. The method comprises steps as follows: each secondary user performs independent spectrum sensing at an initial stage; coalitions are formed among the secondary users; a coalition head in each coalition is selected; utility values of the secondary users are computed; whether the coalitions are formed is judged; coalition partitions are updated; whether the coalitions are in a stable state is judged; data fusion is performed in each coalition; coalition collaborative spectrum sensing is performed finally. Meanwhile, environment change such as master user mobility and the like is considered, and the steps can be periodically repeated. On the basis of the cognitive radio network, the problem about the multi-user collaborative sensing is analyzed with the coalitional game theory; the adaptability to the dynamic change of a wireless environment is improved; the influence of the shadow effect and hidden nodes on the sensing performance is reduced; the inspection probability of spectrum sensing is improved, the interference to a master user is reduced, and the protection for the master user is improved.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a multi-user cooperative spectrum sensing method based on alliance game in a cognitive radio network. Background technique [0002] Wireless communication uses electromagnetic waves to carry and transmit information. Although the spectrum of wireless electromagnetic waves is very wide, in actual use, due to the inherent propagation characteristics of electromagnetic waves and the limitations of radio-enabled devices, there are relatively few spectrums that can be used at present. At the same time, in order to avoid interference, the spectrum allocation has a special radio regulation department to adopt a fixed spectrum allocation principle for unified allocation and management. Research by the Federal Communications Commission of the United States shows that the average utilization rate of the licensed frequency band ranges from 15% to 85%, and the spectrum utiliza...

AI Technical Summary

Problems solved by technology

There are two disadvantages in this method. First, the range controlled by the control center can only be used as a whole to judge the spectrum usage, so that the spectrum holes in some areas cannot be detected, which reduces the spectrum utilization.

Furthermore, the control entity is generally responsible for more secondary user devices, and all secondary users transmit local perception information to the same control center, which consumes more bandwidth

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