Fast Fourier transform-based blind frequency spectrum sensing method and apparatus

一种傅里叶变换、频谱感知的技术，应用在频谱间隙评估、传输监控、网络规划等方向，能够解决噪声不确定性影响等问题，达到不确定性不敏感、复杂度低的效果

Inactive Publication Date: 2013-10-09
SOUTHEAST UNIV
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Problems solved by technology

[0005] Technical problem: In order to overcome the influence of existing energy detection on noise uncertainty, the present invention proposes a blind spectrum spectrum detection method and device based on fast Fourier transform

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  • Fast Fourier transform-based blind frequency spectrum sensing method and apparatus
  • Fast Fourier transform-based blind frequency spectrum sensing method and apparatus
  • Fast Fourier transform-based blind frequency spectrum sensing method and apparatus

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Embodiment Construction

[0032] Below in conjunction with specific embodiment, further illustrate the present invention, should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various equivalent forms of the present invention All modifications fall within the scope defined by the appended claims of the present application.

[0033] A spectrum sensing method based on fast Fourier transform, such as figure 1 described, including the following steps:

[0034] 1) The spectrum sensing device receives the wireless signal on the frequency band to be sensed;

[0035] 2) The spectrum sensing device calculates the autocorrelation coefficient of the signal after sampling and filtering the received signal;

[0036] The N sample signals after sampling and filtering are expressed as x(0), x(1), . . . , x(N-1). In actual implemen...

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Abstract

The invention, which relates to the frequency spectrum sensing technology in a radio system, discloses a fast Fourier transform-based blind frequency spectrum sensing method and apparatus. The method comprises the following steps that: a frequency spectrum sensing device receives a signal at an authorized frequency range; after sampling and filtering are carried out on a received signal; an autocorrelation coefficient of the signal is calculated; fast Fourier transform is carried out on the autocorrelation coefficient and a module value is solved for a conversion result; a decision variable is constructed according to the module value and whether a signal of an authorized user exists is determined. According to the invention, the provided method and apparatus have the advantages of having low calculating complexity, not needing an authorized signal characteristic, being uncertain of and not sensitive of noises and the like and have excellent performances.

Description

technical field [0001] The present invention relates to a spectrum sensing technology in a cognitive radio system, in particular to a blind spectrum sensing method and device without sending any characteristic information of a signal. Background technique [0002] With the rapid development of wireless data services, people's demand for spectrum resources is increasing, and spectrum resources are increasingly scarce. On the other hand, some frequency bands are very underutilized. This makes the traditional pre-allocated, long-term authorized use of static spectrum management methods inefficient. Therefore, how to flexibly and effectively use spectrum resources has become a hot issue. The concept of spectrum sharing based on cognitive radio was first proposed by J.Mitola. This technology makes it possible to flexibly utilize spectrum resources at any time and anywhere. The emergence of cognitive radio technology has greatly improved the spectrum utilization rate and allevi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/00H04B17/382
CPCH04W16/14H04L27/265H04L27/2666H04L27/2676H04L27/0006
Inventor 王东明吴雨霏刘瑞勋王向阳唐文锐黄禹淇
Owner SOUTHEAST UNIV
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