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Method for selecting cognitive users in coordinated spectrum sensing

A technology of cooperative spectrum sensing and user recognition, applied in electrical components, wireless communication, etc., can solve problems affecting system detection performance, improve system transmission efficiency, ensure cooperative sensing performance, and reduce occupancy

Inactive Publication Date: 2014-05-07
SUZHOU UNIV
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Problems solved by technology

The SC method and the PAC method ignore the influence of noise uncertainty. In practical applications, noise uncertainty must exist, which will inevitably affect the actual detection performance of the system.

Method used

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  • Method for selecting cognitive users in coordinated spectrum sensing
  • Method for selecting cognitive users in coordinated spectrum sensing
  • Method for selecting cognitive users in coordinated spectrum sensing

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Embodiment Construction

[0030] The technical scheme of the present invention will be described in detail below in conjunction with specific embodiments:

[0031] First, we give a typical cognitive radio application scenario, assuming that the cognitive system consists of M={1,2,...,M} cognitive users CR, there are multiple primary users PU in the system, and the transmitting base station uses BS said, such as figure 1 shown. Cognitive users CR are independently and randomly distributed in a circular area with a radius of RS around the fusion center FC.

[0032] The working frame mode of the cognitive radio system based on the method of the present invention includes three working time slots of selection, perception, data transmission or silence, such as figure 2 As shown, in this embodiment, the selected time slot is set. The data fusion center FC uses the method of the present invention to select the sensing user before the cooperative sensing. The selection process includes: when the prior know...

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Abstract

The invention relates to a method for selecting cognitive users in coordinated spectrum sensing. According to the method, under the condition that prior knowledge of the signal-to-noise ratio of the cognitive user is unknown, the every-order autocorrelation coefficients of received signals are calculated by all the cognitive users so as to obtain an autocorrelation matrix, then the parameter B capable of expressing sensing properties of the cognitive user is obtained through analyzing calculation of elements of the autocorrelation matrix, the parameter B is transmitted to a data fusion center by the cognitive users, the property difference index delta Bi between each cognitive user and the best property cognitive user is calculated by the fusion center, the users bad in property are kicked out, and the cognitive users participating in coordinated sensing are selected out according to the from-small-to-large rule of delta Bi. With the method for selecting the cognitive users, while the cognitive sensing property is guaranteed, the number of nodes of the cognitive users participating in the cooperated sensing is reduced, network loads are reduced, occupancy of resources of a system is reduced, and the transmission efficiency of the system is also improved.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a cognitive radio technology adopted to effectively solve the shortage of frequency spectrum resources. Background technique [0002] With the rapid development of communication technology and communication industry, spectrum resources are becoming more and more tight. In recent years, cognitive radio technology has been considered as an effective method to solve the shortage of spectrum resources. The main idea is to enable cognitive users (unauthorized users) to share spectrum resources without causing harmful interference to primary users (authorized users). Spectrum sensing is one of the key technologies in cognitive radio. According to the IEEE802.22 wireless area network regulations, the cognitive system should be as far away from the primary user system as possible to ensure that the primary user is free from interference from secondary user transmitters. Of cour...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W24/00H04W24/08H04W72/04H04W40/10
Inventor 欧扬汪一鸣
Owner SUZHOU UNIV
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