Cooperative frequency spectrum perception method

Abstract

The invention provides a cooperative frequency spectrum perception method applied in a cognitive radio system. The method comprises the following steps: configuring the cognitive radio system comprising N secondary users and at least one information fusion center in a network of an existing primary user; based on an energy detection method, acquiring a detection error probability of a single link, wherein the detection error probability of the single link is related with a detection probability, a false alarm probability and a false dismissal probability; when the detection error probability of the single link is a minimum, based on that, acquiring a relation of a threshold value and a signal to noise ratio, therefore, determining an optimal threshold value under the different signal to noise ratios; based on the detection probability of the single link, the false alarm probability and the false dismissal probability, acquiring the detection probability, the false alarm probability, the false dismissal probability and a detection error probability of the cognitive radio system. Compared to the prior art, by using the method of the invention, the detection probability can be greatly increased and the detection error probability of the cognitive radio system can be reduced so that the primary user can be guaranteed not to be disturbed during a process of transmitting data.

Description

technical field [0001] The present invention relates to a cognitive radio technology, in particular to a cooperative spectrum sensing method applied in a cognitive radio system. Background technique [0002] With the development of wireless communication systems, the demand for higher data rates is gradually increasing. On the one hand, due to the limitation of natural spectrum resources, the fixed frequency allocation scheme will not be able to meet the increasing demand for higher data rate equipment. On the other hand, the spectrum utilization ratio of different frequency bands varies greatly. A survey was carried out, which showed that the frequency band above 3GHz is hardly used, while the frequency band below 3GHz has a usage rate of up to 70%. In order to improve spectrum utilization and solve the problem of spectrum shortage, secondary users can be allowed to use the spectrum that primary users do not use at this moment in a certain period of time in a certain area....

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Problems solved by technology

The above literature describes the threshold value calculated according to the minimum probability of system detection error, but only theoretical analysis is done, and the final expression is not given. At the same time, the threshold value and signal-to-noise value of a single link are not given. Relative expression of ratio

In another document "Optimization for cooperative sensing in cognitive radio networks" (Optimization for cooperative sensing in cognitive radio networks; E.Peh and Ying-Chang Liang; in Proc.IEEE Int.Wireless Communication.Networking Conf., Hong Kong, May 11-15, 2007: 27-32) gave the optimal number of users participating in cooperative detection, but the threshold value is assumed to be fixed, which has certain limitations

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