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Method and apparatus for setting judging threshold

A technology of judgment threshold and threshold value, which is applied in the field of setting judgment threshold and single-node energy detection, which can solve unsatisfactory problems and achieve the effect of improving efficiency and ensuring accuracy

Inactive Publication Date: 2009-06-17
BEIJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to meet the needs of various factors in energy detection, it is very important to set the judgment threshold reasonably based on the comprehensive consideration of detection probability and false alarm probability, but the solution to this problem is still far from satisfactory.

Method used

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  • Method and apparatus for setting judging threshold
  • Method and apparatus for setting judging threshold

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Comparison scheme
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Embodiment 1

[0043] In this embodiment, the signal in the current frequency is a spectral signal, and the noise in the current frequency band environment is real Gaussian white noise with an average value of 0, that is, the average power of the noise in the current frequency band environment is: D[n(t)]=δ u 2 .

[0044] Such as figure 1 As shown, a method for setting a decision threshold value, the method includes:

[0045] Step S101: Determine the decision threshold according to the result of maximizing the difference between the false alarm probability and the detection probability of the node itself;

[0046] Step S102: Receive sampled data, calculate a decision value based on the sampled data, compare the decision threshold with the decision value, and determine whether the current frequency band is occupied according to the comparison result.

[0047] Specifically, the decision threshold is specifically determined by the following formula:

[0048]

[0049] Among them, ε repres...

Embodiment 2

[0103] Such as Image 6 As shown, a device for setting a decision threshold, the device includes:

[0104] The calculation processing module S11 is used to determine the judgment threshold value according to the result of the node's own false alarm probability and detection probability equalization difference maximization;

[0105] The data receiving module S12 is used to receive sampled data, so that the decision processing module calculates the judgment amount according to the sampled data;

[0106] The decision processing module S13 is configured to compare the decision threshold value with the decision quantity calculated according to the sampling data, and determine whether the current frequency band is occupied according to the comparison result.

[0107] Specifically, the decision processing module specifically includes:

[0108] A decision quantity calculation unit S131, configured to calculate a decision quantity according to the sampled data;

[0109] The comparis...

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Abstract

The invention discloses a method for setting decisional threshold value, which comprises determining decisional threshold value according to the maximum result of balanced difference of the false alarm probability and the detection probability of a node itself, receiving sampling data, calculating decisional quantity according to the sampling data, comparing the decisional threshold value with the decisional quantity, and judging whether current frequency band is occupied or not according to the comparing result. The invention further discloses a device for setting decisional threshold value. Through employing the technical scheme of the invention, the decisional threshold value can be reasonably set based on two factors of the detection probability and the false alarm probability during the process of energy detecting, which enhances detecting efficiency of the current frequency band, guarantees availability ratio of the frequency band, and finds an optimal solution between the detecting efficiency and the availability ratio.

Description

technical field [0001] The present invention relates to the technical field of radio spectrum sensing, in particular to a method and device for setting a judgment threshold in single-node energy detection in the technical field of radio spectrum sensing. Background technique [0002] Spectrum sensing technology is to analyze the spectrum occupancy status of the wireless environment where the radio system is located based on the air signal received from the radio frequency front end. Spectrum sensing methods can be divided into single-node detection and cooperation-based multi-node joint detection. Among them, energy detection is a commonly used technical means in the single node detection mode. In the energy detection process, the setting of the decision threshold is a very important link for the detection probability and false alarm probability. [0003] At present, in the prior art, previous literatures generally use one of the detection probability and the false alarm p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W24/00H04B17/00H04B17/382
CPCY02D30/70
Inventor 黎晋罗涛郝建军尹长川刘丹谱李剑峰乐光新
Owner BEIJING UNIV OF POSTS & TELECOMM
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