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Adaptive sequential cooperative spectrum detection method

A technology of spectrum detection and cooperative detection, applied in the field of cognitive radio, which can solve problems such as failure of detection results, changes in usage conditions, and impact on system throughput

Inactive Publication Date: 2011-04-06
SOUTHEAST UNIV
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Problems solved by technology

On the one hand, if the detection time is too long, the usage status of the licensed spectrum may change, resulting in invalid detection results
On the other hand, if it takes more time to detect spectral holes, the time to use the spectral holes will be correspondingly reduced, and the throughput of the system will inevitably be affected

Method used

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  • Adaptive sequential cooperative spectrum detection method
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Embodiment Construction

[0038] The specific implementation steps of the adaptive sequential collaborative detection method proposed by the present invention are as follows:

[0039] 1) Initialization. According to the sequential collaborative detection method to complete a detection, the number of sampling points and detection time are recorded as n 0 and Set the initial number of sampling points n 1 and the step size μ of adaptive adjustment; let S 0 =0, i=1.

[0040] 2) All secondary users perform n in parallel i Point sampling, and calculate the energy of each received signal based on these sampling points. The energy of the signal received by the jth secondary user is calculated as follows:

[0041] v j = Σ k = 1 n i ...

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Abstract

The invention relates to a method for cooperatively detecting spectrum holes by a plurality of subprime users in the field of cognitive radio in communication technology. The method is characterized by making a decision on the basis of sequential probability ratio test in a fusion stage and adaptively adjusting sampling points used in a perceptive stage. By the characteristics, the method can ensure the needed detection precision and minimize the detection time. The method comprises the following steps of: a. carrying out parallel sampling and obtaining a perception result according to the sampling points by all subprime users; b. fusing one perception result of the subprime users by a fusion center; c. if the fused perception result is enough, making the decision; or else, returning backto the step b to continue to fuse the perception result of the subprime users; and d. adaptively adjusting the sampling points, if the detection is not stopped, returning back to the step a to carry out next detection.

Description

technical field [0001] The invention belongs to the field of cognitive radio in communication technology, and relates to a method for cooperative detection of frequency spectrum holes by multiple secondary users in a cognitive radio network. Background technique [0002] Spectrum is a valuable resource for wireless communications. In traditional wireless communication systems, spectrum allocation is fixed. Once a section of spectrum is authorized to a user, the user (authorized user, primary user) has exclusive rights to it, and other users (unauthorized users, secondary users) are prohibited from occupying it even if it is not used by itself. This solution is simple to implement and is conducive to ensuring the service quality of the primary user. It has been widely used at the beginning of the development of wireless communication and has been used until now. However, recent studies have shown that primary users are underutilizing licensed frequency bands while exclusive...

Claims

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Application Information

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IPC IPC(8): H04W24/00H04B17/00H04B17/382
Inventor 曹秀英彭盛亮杨喜唐岚
Owner SOUTHEAST UNIV
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