Frequency spectrum perceiving method based on estimation of signal arrival direction

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: 2014-01-01
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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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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  • Frequency spectrum perceiving method based on estimation of signal arrival direction
  • Frequency spectrum perceiving method based on estimation of signal arrival direction
  • Frequency spectrum perceiving method based on estimation of signal arrival direction

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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 spectrum sensing method based on signal arrival direction estimation, which includes: in a cognitive radio system applying smart antenna technology, the signal transmission direction angle is regarded as a spectrum opportunity, and two-step sensing is performed on the primary user signal: First, the primary user signal is detected by the generalized likelihood ratio test method, that is, the ratio of the largest eigenvalue of the sample covariance matrix to the sum of eigenvalues ​​is used as the test statistic, and compared with the decision threshold set according to the given false alarm probability To determine whether the primary user signal exists, if the primary user does not exist, the channel can be used, if the primary user exists, the classic MUSIC algorithm is further used to estimate the direction of the primary user signal arrival. Cognitive users can choose to communicate in other directions that will not cause interference to the primary user. This spectrum sensing method can not only effectively perceive spectrum holes in the time, frequency, and space domains, but also perceive spectrum holes in the angle domain, increasing spectrum opportunities.

Description

technical field [0001] The invention relates to a method for realizing spectrum sensing of a primary user in a cognitive radio, and belongs to the technical field of communication. Background technique [0002] In recent decades, the development of wireless communication technology has advanced by leaps and bounds. The mobile communication system has changed from the first generation (1G) analog communication system (AMPS, TACS), the second generation (2G) global system for mobile communication (GSM) and IS- The 95 system has developed into the third generation (3G) wideband code division multiple access system (WCDM), code division multiple access (CDMA 2000) and time division synchronous code division multiple access (TD-CDMA) system, which has already started commercial use. The stage will evolve to the third generation / fourth generation (B3G / 4G) mobile communication system. Many standards have appeared in the wireless access technology to meet people's demand for data s...

Claims

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Application Information

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Patent Type & Authority Patents(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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