Idle frequency spectrum detecting method by using cyclic spectrum statistic value in cognitive radio

A technology of cognitive radio and idle spectrum, which is applied in the field of idle spectrum detection and cognitive radio idle spectrum detection, and can solve the problem of weak signal of authorized primary user detected by cognitive users

Inactive Publication Date: 2010-01-20
HARBIN INST OF TECH
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for detecting idle spectrum using cyclic spectrum statistics in cognitive radio, so as to solve the problems caused by factors such as shadow and deep fading in the existing cognitive radio, and the signal of the primary user authorized by the cognitive user detection is weak and misjudgment

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  • Idle frequency spectrum detecting method by using cyclic spectrum statistic value in cognitive radio
  • Idle frequency spectrum detecting method by using cyclic spectrum statistic value in cognitive radio
  • Idle frequency spectrum detecting method by using cyclic spectrum statistic value in cognitive radio

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specific Embodiment approach 1

[0021] Specific embodiment one: the steps of this embodiment are as follows: step one: first perceive the real part of the cyclic spectrum of the signal received by the user Z = Re [ S y A ( l ) ] = S y A ( l ) + S y A ( l ) ‾ 2 Modeled under a white Gaussian noise channel as a random variable with the following mean and variance:

[0022] Z ~ Norm ...

specific Embodiment approach 2

[0034] Embodiment 2: This embodiment is a further description of step 1 in Embodiment 1. The process of deriving the probability density distribution of cyclic spectrum statistics adopts the following steps:

[0035] Step A: The discrete frequency domain solution expression of the cyclic spectrum of the signal is as follows,

[0036] S y a ( f ) = 1 ( N - 1 ) T s M Σ u = - ( M - 1 ) / 2 ( M - ...

specific Embodiment approach 3

[0095] Specific embodiment three: the difference between this embodiment and embodiment one is that it also includes step 4, calculating the accuracy probability of the detection result:

[0096] When C<0,

[0097] P D = ∫ - ∞ T 1 2 π ( D + B ) e - ( z - C ) 2 2 ( D + B ) dz ...

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Abstract

The invention relates to an idle frequency spectrum detecting method by using cyclic spectrum statistic value in a cognitive radio. The invention relates to a method for detecting idle frequency spectrums by using cyclic spectrum statistic value. The method solves the error judgment problem caused by that in the existing cognitive radio, owing to the influence of factors such as shadow, shading depth and the like, a cognitive user detects feeble signals of an authorized master user. The method comprises the following steps of: firstly, modeling the real part of the cyclic spectrum of signals received by the cognitive user to obeyed mean value and random variable of variance in a gauss white noise channel; step two, by probability distribution under the H0 assumed condition, and obtaining signal judgment threshold under the given false-alarm probability index; step three, allowing the idle frequency spectrum to be used when C is larger than or equal to 0 and the real part Z of the cyclic spectrum of the received signals is less than the judgment threshold T, or when C is less than 0 and the real part Z of the cyclic spectrum of the received signals is larger than the judgment threshold T; otherwise, not allowing the non idle frequency spectrum to be used. The method can cause the cognitive user to detect the signals of the authorized master user under the lower signal-to-noise ratio condition.

Description

technical field [0001] The invention relates to a method for detecting idle frequency spectrum by using cyclic spectrum statistics. It belongs to the technical category of cognitive radio idle frequency spectrum detection. Background technique [0002] In recent years, with the rapid development of wireless communication services, more and more wireless spectrum resources are required, and spectrum resources are becoming more and more scarce. Cognitive Radio is an opportunistic way to share and improve spectrum utilization. rate technology. The concept of cognitive radio was first proposed by Dr. Joseph Mitola of Sweden. The purpose of cognitive radio vacant spectrum sensing is to find available vacant licensed frequency bands, then allocate frequencies in this vacant frequency band, and set corresponding parameters for communication. Therefore, spectrum sensing is an important part of cognitive radio system work. [0003] In the actual wireless environment, the transmis...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/00H04B17/382
Inventor 石磊张中兆
Owner HARBIN INST OF TECH
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