Space diversity based authorization user signal detecting method

A technology of authorization signal and detection method, which is applied in the direction of transmission monitoring, electrical components, transmission system, etc., can solve the problems of detection performance degradation and detection capability limitation, so as to improve performance, meet the requirements of detection performance, reduce multipath and The effect of the fading effect

Inactive Publication Date: 2008-03-05
SOUTHEAST UNIV
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Problems solved by technology

The early detection methods used energy detection and cycle stationary process feature detection, etc., but the detection performance will decrease with the weakening of the received signal strength caused by multipath and shadow fading. In addition, the detection ability itself has certain limitations, so in order to realize Reliable detection requires exploration of new methods

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  • Space diversity based authorization user signal detecting method
  • Space diversity based authorization user signal detecting method
  • Space diversity based authorization user signal detecting method

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Embodiment Construction

[0025] The authorization signal detection method based on spatial diversity in the present invention combines distributed detection with centralized decision-making. First, each sensing terminal in the sensing sub-area performs distributed sampling on the authorization signal, and then independently processes the sampled signal. Finally, the The access point collects the processing results of each sensing terminal and executes a decision to determine whether the authorization signal occurs. The method includes the following five processes and is performed in the order described:

[0026] 1) Periodic sampling process: each sensing terminal in the sensing sub-area independently periodically samples the authorization signal,

[0027] 2) Wavelet transform processing process: Each sensing terminal uses wavelet transformer to perform multi-scale wavelet transform on the sampling sequence, and sets different threshold values ​​at each scale to judge the results after wavelet transform...

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Abstract

This invention relates to a test method for authorized user signals based on variety of space including five steps: each perception terminal of a perception region samples authorized signals periodically and independently and then transforms wavelets in multiple sizes to a sample signal sequence to judge the transformation result by judgers for different sizes and finally a correlator judges if the authorization signal appears or not independently, which utilizes the variety of perception terminals distributed in space and access points of sub-areas to collect the judgment results and execute the decision, which is finished by the correlator, and the access point broadcasts the test result, if it finds out that the authorized user begins using the band, the perception users should give up the use of the band, if not, they can use it continuously.

Description

technical field [0001] The invention utilizes the diversity of the spatial distribution of the cognitive wireless terminals, and the technology that each terminal can detect sudden changes based on wavelet analysis is applied to the detection of authorized user signals in the wireless wireless network. Background technique [0002] Cognitive radio is a wireless communication concept and technology that has emerged in recent years. It can sense all spectrum usage opportunities in the current communication environment. In other words, by reorganizing the framework of the wireless network system, the cognitive wireless network has the ability to intelligently identify and change spectrum use opportunities. This aspect of the cognitive wireless network can reset the reorganization of its network, and can optimize the use of the perceived spectrum opportunities according to the network architecture, wireless resources, communication settings, etc. These kinds of network collabor...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707H04B17/00H04B17/309
Inventor 沈连丰朱晓荣夏玮玮胡静宋铁成
Owner SOUTHEAST UNIV
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