Method for detecting frequency spectrum hole in cognitive radio

Abstract

The invention provides a solving method which coordinates a cognitive radio system to enhance robustness detection. The method for detecting a frequency spectrum hole in cognitive radio mainly comprises the following steps: independently sampling a frequency spectrum environment which needs to be detected by a plurality of cognitive users of a cognitive system in different geographical positions so as to obtain perceptive signals; sending perceptive data obtained by means of sampling by the cognitive user through a control channel in the cognitive system to a cognitive based station; receiving a plurality of perceptive signals and splitting the perceptive signals into a plurality of shorter perceptive signal sections with identical slot time by the cognitive based station, and obtaining a perceptive signal matrix through data infusion; and calculating the perceptive signal matrix and a covariance matrix, maximum and minimum eigenvalues of the covariance matrix and eigenratio of the maximum eigenvalues and minimum eigenvalues, comparing the eigenratio with a decision threshold, and judging whether the frequency spectrum hole exists or not. The method for detecting the frequency spectrum hole in the cognitive radio can effectively improve systematic detecting performance under the condition that the number of cooperative users are less.

Description

technical field

[0001] The invention relates to a method for detecting a spectrum hole in a cognitive radio, in particular to a method for detecting a spectrum hole by using cooperative sensing of multiple cognitive users. Background technique

[0002] Wireless communication spectrum is a very valuable natural resource, generally authorized by the government. The wireless spectrum allocation method is to permanently authorize a certain section of spectrum to a user. With the development of wireless services, wireless spectrum resources are gradually scarce, and the disadvantages of fixed spectrum allocation are constantly emerging. In practical applications, the frequency requirements are very tight mainly in the wireless frequency bands with a frequency band of hundreds of MHz-3GHz. Some frequency bands are not used by users most of the time, and some are only occasionally occupied, while other frequency bands are used. is relatively frequent. How to improve spectrum uti...

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