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Spectrum perception method for detecting angle of arrival of authorized user in cognitive radio

A cognitive radio and authorized user technology, applied in the field of detecting authorized user signals and angle of arrival, can solve the problems of method limitation, unable to detect multi-dimensional information of authorized users, etc., and achieve the effect of good detection performance

Inactive Publication Date: 2010-08-18
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current method cannot detect the multi-dimensional information of the authorized user, and the method itself has certain limitations.

Method used

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  • Spectrum perception method for detecting angle of arrival of authorized user in cognitive radio
  • Spectrum perception method for detecting angle of arrival of authorized user in cognitive radio
  • Spectrum perception method for detecting angle of arrival of authorized user in cognitive radio

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Embodiment Construction

[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific examples.

[0022] (1) if figure 1 As shown, firstly, the M-element linear multi-antenna system receives narrow-band far-field signals within a certain period of time. Since the phases of the signals received by each array element are different, the purpose of performance optimization can be achieved through reasonable combination processing. Suppose the signal received by the lth array element is

[0023] x l ( t ) = Σ i = 1 N g li s i ( t - τ li ) + n l ( t )...

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Abstract

The invention discloses a spectrum perception method for detecting the angle of arrival of an authorized user in cognitive radio, and relates to a spectrum perception method in a cognitive radio system, in particular to a method capable of detecting the signal and the angle of arrival of the authorized user. The method comprises the following steps that: a linear array antenna system receives the signal; the spatial spectrum of the signal is obtained through multiple signal classification algorithm; the statistical average of the spatial spectrum Lambda serves as judgment reference; the threshold Gamma which meets false alarm probability Pf is obtained through a test; Lambda and threshold Gamma are compared to judge if the authorized user exists; and if the authorized user exists, the angle of arrival of the authorized user is obtained through minimum optimization searching. The method for detecting the multi-dimensional information of the authorized use provides conditions for further flexibly applying the frequency band of the authorized user.

Description

technical field [0001] The present invention relates to a spectrum sensing method in a cognitive radio system, in particular to a method capable of detecting authorized user signals and angle of arrival. Background technique [0002] With the rapid development of wireless communication technology and the great enrichment of wireless services, the increasing number of radio users makes the spectrum resources more and more tense, and the currently used spectrum only accounts for 2% to 6% of all available spectrum. Cognitive radio technology that can dynamically manage spectrum resources is becoming a hot spot to solve this problem. [0003] As an intelligent spectrum sharing technology, cognitive radio can rely on the support of artificial intelligence to perceive the wireless communication environment, and according to certain learning and decision-making algorithms, it can adaptively change the system operating parameters in real time, dynamically detect and effectively use ...

Claims

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Application Information

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IPC IPC(8): H04W16/14H04W24/00H04B7/04
Inventor 杜利平郭志立周贤伟李苗门玉苹吕莹雷雨
Owner UNIV OF SCI & TECH BEIJING
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