Method for optimal joint idle spectrum detection of cognitive radio

Abstract

The invention relates to a method for the optimal joint idle spectrum detection of a cognitive radio, belonging to the field of the idle spectrum detection of the cognitive radio and solving the problems that a joint detection probability is not a maximum value under the constant false-alarm probability of a fusion center in the spectrum cooperation detection of the prior cognitive radio. The invention obtains the maximum value of a detection probability PD by a mathematical constrained optimization method under the condition that a false-alarm probability PF given by the fusion center is constant, obtains a judge fusion criterion P(U0=1 | vector u) of various perception users and various perception user thresholds 1I and uses the fusion criterion P(U0=1 | vector u) for enabling the detection probability PD to obtain the maximum value and various perception user thresholds 1I which are obtained as working parameters of a joint detection system. The method for the optimal joint idle spectrum detection of the cognitive radio is applied to the field of wireless communication and can improve the performance of joint detection so as to detect signals of main users under a lower signal-to-noise ratio condition, thereby having important application value in the idle spectrum detection of the cognitive radio.

Description

technical field The invention relates to an optimal joint idle spectrum detection method, which belongs to the technical category of cognitive radio idle spectrum detection. Background technique In recent years, with the rapid development of wireless communication services, more and more wireless spectrum resources are required, and spectrum resources are becoming more and more scarce. Cognitive Radio is an opportunistic way to share and improve spectrum utilization. rate technology. The concept of cognitive radio was first proposed by Dr. Joseph Mitola of Sweden. The purpose of cognitive radio vacant spectrum sensing is to find available vacant licensed frequency bands, then allocate frequencies in this vacant frequency band, and set corresponding parameters for communication. Therefore, spectrum sensing is an important part of cognitive radio system work. At present, in the actual wireless environment, signal transmission will be affected by factors such as shadows and...

AI Technical Summary

Problems solved by technology

In order to solve the problem existing in the existing cognitive radio frequency spectrum distributed joint detection method, under the constant false alarm probability of the fusion center, the joint detection probability is not a maximum value, and proposes a cognitive radio optimal Joint idle spectrum detection method

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