Frequency spectrum cognitive method and energy detection method and device

Abstract

The invention discloses a frequency spectrum cognitive method, cognitive radio user equipment and the structure of a central node in a cognitive radio system. In the frequency spectrum cognitive method, at least one cognitive radio user in the cognitive radio system detects signals of a main user in a selected channel, and sends the detection result to the central node of the cognitive radio system, wherein the detection result is the parameter correlative with the average signal-to-noise ratio of the channel; and the central node combines the detection results from all the cognitive radio users detecting the same channel, makes the conclusive judgment according to the result of the combination to obtain the judgment result on whether the channel is occupied by the main user in a main usersystem, and can further return the result to all the cognitive radio users. Besides, the invention also discloses a method and a device for energy detection.

Description

technical field [0001] The present invention relates to cognitive radio technology, in particular to a method and corresponding device for realizing spectrum sensing in a cognitive radio system, and an energy detection method and corresponding device. Background technique [0002] With the rapid development of wireless communication technology, spectrum resources are becoming increasingly tight. Especially with the development of wireless local area network (WLAN) technology and wireless personal area network (WRAN) technology, more and more people access the Internet in a wireless manner through these wireless communication technologies. Most of these network technologies work in unlicensed frequency bands, which has gradually saturated the unlicensed frequency bands. However, in order to provide protection for some specific communication services (such as TV broadcasting services, etc.), the frequency management department has specially allocated specific separate frequen...

AI Technical Summary

Problems solved by technology

In the above spectrum sensing method, the central node does not consider the difference in detection performance between each cognitive radio user due to different channel conditions in the decision process, therefore, the spectrum sensing results are not accurate, and there is a high probability of missing alarms ( The probability of the judgment result of the main user being "silent" when the main user is "active") or the probability of false alarm (the probability of the judgment result of the main user being "active" when the main user is "silent")

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