Spectrum sensing method for cognitive anti-interference communication system

A spectrum sensing and communication system technology, applied in wireless communication, transmission system, transmission monitoring and other directions, can solve the problem of low performance of energy detection spectrum sensing method, and achieve the effect of improving sensing accuracy

Inactive Publication Date: 2018-05-04
BEIJING UNIV OF TECH
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AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is the low performance of traditional fixed threshold energy detection spectrum sensing method in time-varying channel environment

Method used

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  • Spectrum sensing method for cognitive anti-interference communication system
  • Spectrum sensing method for cognitive anti-interference communication system
  • Spectrum sensing method for cognitive anti-interference communication system

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Experimental program
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Embodiment 1

[0036] Step 1: Set the initial decision threshold λ according to the spectrum sensing performance of CR stations 0 = 1.5;

[0037] Step 2: Calculate the average energy of the received signal 2.0 according to the 5 samples of the received signal of the cognitive radio station quantized by AD;

[0038] Step 3: Estimate the noise power 0.2 in the kth signal sample;

[0039] Step 4: Calculate the adaptive threshold scaling factor ρ=0.9;

[0040] Step 5: Compare the received signal average capability Tα(2.0) with the initial threshold λ 0 (1.5), if T α ≥λ 0 Then set the new threshold as λ 0 / ρ=1.67;

[0041] Step 6: According to the reset decision threshold λ new (1.67) and the energy of the received signal to judge, if the energy of the received signal is greater than λ new , it is determined that the frequency band is occupied; otherwise, it is determined that the frequency band can be used.

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Abstract

The invention provides a spectrum sensing method for a cognitive anti-interference communication system. The method comprises the following steps: an average energy of M received signal samples withina frequency band is firstly calculated; the calculated energy is then compared with an initial threshold, and a new judgment threshold is reset according to a comparison result; if the energies of received signals are larger than the new threshold, interference on a channel is determined; and if the energies of the received signals are not larger than the new threshold, the interference on the channel is denied. The method provided by the invention has the advantages that through setting of the adaptive judgment threshold, the problem that accurate spectrum sensing cannot be achieved throughfixed-threshold energy detection in a time-varying channel is solved, and the sensing precision is effectively improved.

Description

technical field [0001] The invention belongs to the field of cognitive wireless communication, and in particular relates to a spectrum sensing method of a cognitive anti-interference communication system. Background technique [0002] In current military communication systems, spread spectrum technology is the most widely used anti-jamming technology. Spread spectrum anti-interference technology usually adopts direct spread (DS) and frequency hopping (FH). The anti-interference principle is to expand the signal in the frequency domain, reduce the signal power density, and hide the target signal in the interference signal and noise. , so as to avoid being intercepted by the enemy to achieve anti-jamming. [0003] With the continuous development of various new electronic attack modes and technologies such as smart network countermeasures and cooperative jamming, the anti-jamming capability of military communication stations is facing more severe challenges, and the traditiona...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W16/14H04B17/382H04B17/345
CPCH04W16/14H04B17/345H04B17/382
Inventor 黎海涛吴晓媛
Owner BEIJING UNIV OF TECH
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