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Frequency spectrum sensing method

A technology of spectrum sensing and equations, which is applied in the field of spectrum sensing to achieve the effects of easy perception, improved detection probability, and improved SNR

Inactive Publication Date: 2011-10-19
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems existing in the spectrum sensing process of the existing fixed parameter SR system, and propose a spectrum sensing method

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Embodiment Construction

[0015] Combine below figure 1 and figure 2 The spectrum sensing method of the present invention is described, specifically including the following steps:

[0016] S1. Accept the received signal r(t) to be sensed by the receiving device, where r(t)=s(t)+n(t), s(t) is the authorized user signal; n(t) is the mean value of zero Variance is Gaussian white noise;

[0017] S2. Determine the SR system parameter b: the SR system passes the langevin equation describe, among them, The parameter a is fixed, so that the parameter a satisfies the adiabatic approximation condition, and then the noise variance is obtained according to the received signal r(t) by a and The value of determines parameter b. The specific determination process of parameter b is as follows:

[0018] Using the adiabatic approximation (Adiabatic Approximation) theory, when the signal r(t)=s(t)+n(t) passes through the bistable SR system defined by the langevin equation, the SNR of the output signal x(t) ...

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Abstract

The invention belongs to the technical field of cognitive radio, and discloses a a frequency spectrum sensing method, wherein the method provided by the invention is designed for solving the problems in a frequency spectrum sensing process of the existing fixed parameter SR (stochastic resonance) system. The method for sensing the frequency spectrum provided by the invention comprises the following steps: fixing a parameter a of the SR system firstly, acquiring a noise variance sigma <2>n by utilizing received signals r (t), and determining the other parameter b of the SR system by the valuesof a and sigma <2>n finally. The SR system and properties of the received signals are matched through regulating the parameters of the SR system by the sensing method provided by the invention, the method has the self-adaptation characteristic, resonance can be generated more easily, the SNR (signal-to-noise ratio) of output signals is improved obviously, the detection probability is improved, and whether authorized users exist can be sensed more easily, thus the performance of frequency spectrum sensing is improved.

Description

technical field [0001] The invention belongs to the technical field of cognitive radio, and in particular relates to a spectrum sensing method. Background technique [0002] Cognitive Radio (CR) technology is proposed to solve the current scarcity of spectrum resources, and the spectrum sensing algorithm is one of the key technologies of cognitive radio. In order to avoid the cognitive radio system from causing harmful interference to licensed users, it is required that the spectrum sensing method can reliably detect licensed user signals under low signal-to-noise ratio. Energy detection is a common spectrum sensing method, but the detection probability is low under low Signal-to-Noise Ratio (SNR), which does not meet the requirements of cognitive radio technology. [0003] It is found that the received signal to be sensed can significantly improve the SNR of its output through a parameter-matched stochastic resonance (SR) system, so applying the SR theory to the energy det...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/00H04W24/08H04B17/309
Inventor 张少文王军李少谦
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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