Synergic frequency spectrum perception method based on amphimorphic credible

Abstract

The invention provides a collaboration spectrum sensing method based on duplicate credibility which includes steps as follows: each second user i processes frequency spectrum independently of each other locally for obtaining frequency spectrum detection amount XEi; each second user i processes creditableness expression to the frequency spectrum detection amount XEi in the m time by using the formulation as follows; each second user SUi sends the detection result creditableness degree mi (H1m) and mi (H0M) to a fusion center AP, the fusion center AP uses a self-adapted iterative algorithm to estimate a priori information P1m, P0m, PDim and PFim firstly, then uses the follow formulation for obtaining the i-th second user SUi sensing creditableness cim in the m-th time according with a data optimizing fusion theory; the mi(HIm), mi(HOm) and ci(m) is obtained by the above steps, the fusion center AP uses the follow formulation for judging whether a main user PU existing in the m-th time, and outputs the final judged result u0m. The method can improve reliability of each second user, and improve the detection performance of the system.

Description

technical field [0001] The present invention relates to the field of Cognitive Radio (CR for short) in communication technology, and specifically relates to a cooperative spectrum sensing method. Background technique [0002] As the demand for wireless communication continues to grow, the demand for wireless spectrum resources also increases accordingly, resulting in increasingly tight spectrum resources. However, the spectrum resources allocated to existing wireless systems are idle to varying degrees in time and space. The cognitive radio (CR) technology proposed by people can make full use of those idle spectrum resources in time and space, and effectively solve the above problems. [0003] Cognitive radio devices adapt to environmental changes by adaptively adjusting their own internal communication mechanism. The secondary user (SU) must be able to detect the existence of the primary user (PU) sensitively to avoid interference with the normal operation of the PU. Corr...

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Problems solved by technology

[0008] From the above introduction, it can be seen that the combination of "AND" can greatly reduce the probability of false alarms, but the detection probability of each secondary user SU to the primary user PU is required to reach 100%, otherwise the detection performance of the system will be greatly reduced. Decrease; "OR" combination can guarantee a higher detection probability when the secondary user SU detection signal is greatly interfered, but it brings a higher false alarm probability and reduces the spectrum utilization

[0009] The combination of "and" and "or" is based on the equivalent consideration of the detection results of each secondary user SU, but in actual situations, due to the difference in the channel environment, device detection sensitivity, and the distance between the secondary user SU and the primary user PU , the reliability and perceptual reliability of each secondary user SU's single local detection result (that is, the perception ability) are not the same, resulting in the reliability of each secondary user SU cannot be guaranteed, so "and", "or "Combining is not optimal for collaborative sensing algorithms

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