Dynamic spectrum access method

A dynamic spectrum access and spectrum technology, which is applied in transmission monitoring, network planning, electrical components, etc., can solve the problem that cognitive user spectrum sensing and spectrum access cannot be carried out at the same time, and reduce the collision probability of cognitive users and authorized users, etc. , to achieve real-time performance, avoid transmission collisions, and reduce waiting time

Active Publication Date: 2014-05-07
上海东亚地球物理勘查有限公司
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art, solve the problem that cognitive user spectrum sensing and spectrum access cannot be carried out simultaneously, and provide a d

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Embodiment Construction

[0034] The dynamic spectrum access method of the present invention is as follows figure 1 , in the cognitive network, the cognitive user continuously perceives the spectral signal in the surrounding environment, so the spectral signal in the cognitive user’s surrounding environment includes the channel noise spectral signal n(t), the licensed user spectral signal x(t) and Cognitive users themselves interfere with the spectral signal s(t). Since the licensed user spectrum is often idle, the signal r(t) perceived by the cognitive user includes the situation H where there is no licensed user signal spectrum 0 and the scenario H where there is a licensed user signal spectrum 1 ,which is:

[0035] h 0 : r(t)=n(t)+s(t), (1)

[0036] h 1 : r(t)=n(t)+s(t)+x(t) (2)

[0037] The sensing time t should be less than the cognitive user spectrum detection time, that is, 0≤t≤T s , that is to say, cognitive users in 0≤t≤T s The time period receives the signal r(t).

[0038] In the pr...

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Abstract

The invention relates to a dynamic spectrum access method. Spectrum signals in surrounding environments are continuously perceived by cognitive users to obtain and access spare authorized user spectrums, and surrounding signal spectrums are continuously perceived when the authorized user spectrums are accessed. Interference signals in spectrum detection are estimated by the aid of radio-frequency signals of the cognitive users, the influence of transmission signals of the cognitive users on spectrum detection is eliminated, and spectrum detection and spectrum access are simultaneously performed by the cognitive users. Specifically, characteristics of the radio-frequency signals of the cognitive users are extracted, the interference signals in spectrum detection signals are estimated, the influence of the transmission signals of the cognitive users on spectrum detection is eliminated, spectrum perception and spectrum access of the cognitive users are simultaneously realized, and the problem of difficulty in current perception dynamic spectrum access is solved.

Description

technical field [0001] The present invention relates to a cognitive network dynamic spectrum access and management technology, and more specifically relates to a dynamic spectrum access technology in which spectrum sensing and spectrum access are performed simultaneously. Background technique [0002] The spectrum utilization rate of most wireless frequency bands is only about 10%, which makes a large number of already scarce spectrum resources idle, which cannot adapt to the rapid development of wireless communication services. [0003] The dynamic spectrum access technology of Cognitive Radio (CR) endowed with cognitive functions is recognized as an effective technical means to efficiently utilize wireless spectrum resources, and has become a hot spot in the industry. There are two core issues in realizing dynamic spectrum access: opportunity discovery and channel access. Accurate detection of spectrum "holes" is the basis for efficient spectrum reuse, and effective acces...

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Application Information

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IPC IPC(8): H04B17/00H04W16/14H04B17/382
Inventor 张士兵张丽刘燕邹丽
Owner 上海东亚地球物理勘查有限公司
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