Frequency spectrum detecting method based on limited random matrix

A random matrix and spectrum detection technology, which is applied to spectrum detection in cognitive radio systems, and in the field of spectrum detection, can solve problems such as detection performance degradation

Active Publication Date: 2014-08-06
XIDIAN UNIV +1
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Problems solved by technology

However, this method can only use infinite sampling points to determine the approximate detection threshold, and its detection performance decreases accordingly

Method used

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  • Frequency spectrum detecting method based on limited random matrix
  • Frequency spectrum detecting method based on limited random matrix
  • Frequency spectrum detecting method based on limited random matrix

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Experimental program
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Embodiment Construction

[0037] refer to figure 1 , the implementation steps of the present invention are as follows:

[0038] Step 1, the detection user collects the data of the frequency band according to the frequency band to be observed.

[0039] According to the frequency band to be observed, the detection user uses the corresponding filter to filter out the signal of this frequency band, and then, under the prerequisite of satisfying the sampling theorem, collects the data of this frequency band to obtain the collected data x(n), where n=1,...,N.

[0040] Step 2, detect the user to construct the data matrix X and calculate the covariance matrix R according to the collected data x(n) x .

[0041] 2a) Detect the user to construct M rows N based on the collected data x(n) s Data matrix X with columns:

[0042] X = x ( 1 ) ...

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Abstract

The invention discloses a frequency spectrum detecting method based on a limited random matrix. The method mainly solves the problem that according to an existing spectrum detecting method based on a characteristic value, a detection threshold is difficult to obtain, and the energy frequency spectrum detection method is greatly affected by noise uncertainty. The method comprises the implementation steps of (1) collecting data x (n) of the frequency band by a detection user according to the detected frequency band, (2) constructing a variance matrix Rx by the detection user according to the collected data, and performing Cholesky decomposition on the matrix, (3) calculating the detection statistical magnitude T Xi, (4) analyzing the probability distribution of the detection statistical magnitude T Xi, calculating the detection threshold gamma Xi under the target false alarm probability according to the probability distribution of T Xi, and (5) comparing the detection statistical magnitude with the detection threshold by the detection user, and judging whether a main user exists or not. The method has the advantages of being resistant to noise uncertainty, accurate in detection threshold and high in detection performance and can be used in wireless communication.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to a spectrum detection method, which can be used for spectrum detection in a cognitive radio system. Background technique [0002] With the rapid development of wireless and mobile communications, the contradiction between the increasing demand for wireless spectrum and the limited spectrum resources has become a prominent contradiction in the current wireless communication industry. The phenomenon of extremely low utilization rate. In order to improve the status quo of low spectrum utilization, J.Mitola and others proposed the concept of cognitive radio. The main idea is to find free frequency bands in the licensed frequency bands, and allow cognitive radio without affecting the normal communication of licensed users. Users can detect and access the currently idle frequency band, thereby greatly improving spectrum utilization. In order to make full use of the spectr...

Claims

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Application Information

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IPC IPC(8): H04B17/00
Inventor 周福辉李赞杨鼎刘向丽杜军朝刘惠高锐黄海燕关磊熊天意胡伟龙
Owner XIDIAN UNIV
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