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A Spectrum Sensing Method Based on Signal Direction of Arrival Estimation

A spectrum sensing and direction estimation technology, applied in the field of communication, can solve the problems of waste of spectrum resources and tight spectrum demand, and achieve the effect of increasing spectrum opportunities.

Inactive Publication Date: 2011-12-21
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

This fixed spectrum allocation method causes a waste of spectrum resources and is one of the main reasons for the tight demand for spectrum.

Method used

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  • A Spectrum Sensing Method Based on Signal Direction of Arrival Estimation
  • A Spectrum Sensing Method Based on Signal Direction of Arrival Estimation
  • A Spectrum Sensing Method Based on Signal Direction of Arrival Estimation

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Embodiment Construction

[0028] In order to make the technical solution of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0029] Spectral opportunities in the direction-angle domain, see figure 1 . In the figure, both the primary user and the cognitive user transmit directional signals. When primary user A communicates with primary user B in one direction 1, cognitive user A can communicate with cognitive user B in direction 2. Angle can thus be perceived as a spectrum opportunity.

[0030] Cognitive devices communicate by discovering spectral "holes" through spectrum sensing. Assuming that the cognitive user receiver has a uniform linear array of M array elements, the distance between the array elements is , Less than half of the carrier wavelength of the PU signal, there is narrowband signal, the carrier wavelength is , the incident angle is ,use Indicates that the PU signal does not exist...

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Abstract

The invention discloses a frequency spectrum perceiving method based on the estimation of a signal arrival direction, which comprises the steps: in a cognitive radio system to which smart antenna technology is applied, the direction and the angle of signal transmission are used as a frequency spectrum opportunity, and a master user signal is subjected to two-step perception: firstly, the master user signal is detected by using a method based on a generalized likelihood ratio test, namely that the ratio of the maximum eigenvalue to the sum of the eigenvalues of a sample covariance matrix is used as test statistics; the test statistics are compared with a decision threshold which is set according to a given false alarm probability so as to decide whether the master user signal exists or not; if a master user does not exist, then the channel can be used, and if the master user exists, then a classical MUSIC (Multiple Signal Classification) algorithm is further used to estimate the arrival direction of the master user signal. A cognitive user can select other directions for communication, which do not cause disturbance to the master user, and the frequency spectrum perceiving method can effectively perceive time, frequency and the frequency spectrum vacancy of a space domain, perceive the frequency spectrum vacancy of an angle domain, and increase the frequency spectrum opportunity.

Description

Technical field [0001] The invention involves the implementation method of the main user spectrum in cognitive radio, which is the field of communication technology. Background technique [0002] In recent decades, the development of wireless communication technology has made its progress. The mobile communication system has been from the first generation (1G) simulation communication system (AMPS, TACS), the second-generation (2G) global mobile communication system (GSM) and IS-95 System developed to the third-generation (3G) broadband code sub-site (WCDM), code division multiple address (CDMA 2000), and time synchronization code division multiple address (TD-CDMA) system that has already begun.The stage will evolve to the latter three generations / fourth generation (B3G / 4G) mobile communication system.There are many standards for wireless access technology to meet people's demand for data business, such as Wireless Domain Network (WPAN), Wireless LAN (WLAN), and Wireless Urban D...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/00H04W16/14H04B7/04H04B17/382
Inventor 谢晶晶傅志中鲜海滢徐进刘洪盛
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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