Energy detection method based on p-power wireless cooperative spectrum sensing

A technology of cooperative spectrum sensing and energy detection, applied in the field of cognitive radio, can solve the problem of low detection probability

Active Publication Date: 2015-06-24
HOHAI UNIV
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  • Abstract
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Problems solved by technology

However, the above methods are all based on the operation of the 2nd power of the signal sampling amplitude, and there is a problem of low detection probability in the application, which needs to be solved

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  • Energy detection method based on p-power wireless cooperative spectrum sensing
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  • Energy detection method based on p-power wireless cooperative spectrum sensing

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Embodiment Construction

[0036] The present invention will be further described in detail below in conjunction with the examples, which are not intended to limit the present invention.

[0037] The energy detection method based on p-th power wireless collaborative spectrum sensing provided in this embodiment is specifically:

[0038] (Construct p-th power model)

[0039] For binary hypothesis tests:

[0040] h 0 :y n = ω n (1);

[0041] h 1 :y n = αs n +ω n

[0042] Wherein, n=1, 2, ... N, indicating that the sampling sample space of the signal has N sampling values. In cognitive radio systems, H 0 Indicates that the authorized user signal does not exist, H 1 Indicates that an authorized user signal exists. the y n Indicates the nth signal sample, s n is the signal part transmitted by the authorized primary user, and α is the channel gain parameter. Assume the noise part ω n is the mean is 0 and the variance is σ 2 Gaussian noise, the transmitted signal s n is mean 0, variance σ ...

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Abstract

The invention discloses an energy detection method based on p-power wireless cooperative spectrum sensing. The energy detection method includes the following steps that under the Gaussian channel environment, p-power is used for replacing 2-power to obtain energy of each path of wireless electric signals, and a detection signal is substituted into a likelihood function to obtain detection statistics; a judgment threshold based on p-power detection is worked out by means of the Neyman-Pearson criterion according to given false alarm probability; the obtained statistics and the judgment threshold based on p-power detection are compared. According to the energy detection method, p-power is used for replacing changeless 2-power and is applied to cooperative spectrum detection; meanwhile, the mean and variance of decision variable p-power are approximated as the mean and variance of Gamma distribution, energy detection based on p-power wireless cooperative spectrum sensing is achieved, complexity is low, timeliness is high, p values can be selected according to different channel environments and signal intensity, and therefore detection performance is effectively improved.

Description

technical field [0001] The invention belongs to the field of cognitive radio, and in particular relates to a cognitive radio cooperative spectrum sensing energy detection method under Gaussian channel conditions. Background technique [0002] Energy detection is an effective spectrum detection method for cognitive radio cooperative spectrum sensing, which does not require any prior information. The advantage is that the implementation complexity is low and accurate information of authorized users does not need to be obtained, which avoids false detection due to inaccurate information acquisition. The Equal Gain Combing (EGC) method of energy detection is an energy detection method that directly takes the amplitude value of the detection signal sampled to the second power, accumulates it, and compares it with the relevant decision threshold, that is, each sampling amplitude The weighting factor in front of the value quadratic is the same regardless of the reliability of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/382
Inventor 毛明禾曹宁叶玉昌陈晓阳胡一帆
Owner HOHAI UNIV
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