Multi-threshold spectrum sensing method based on noise variance estimation

A noise variance estimation and spectrum sensing technology, applied in transmission monitoring, electrical components, transmission systems, etc., can solve problems such as no energy detection, and achieve the effect of overcoming influence, improving accuracy, and improving spectrum utilization.

Inactive Publication Date: 2017-03-15
重庆信科设计有限公司
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Problems solved by technology

However, there is no energy detection method for estimating the noise power

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  • Multi-threshold spectrum sensing method based on noise variance estimation
  • Multi-threshold spectrum sensing method based on noise variance estimation
  • Multi-threshold spectrum sensing method based on noise variance estimation

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Embodiment Construction

[0037] The technical solutions in the embodiments of the present invention will be described clearly and in detail below with reference to the drawings in the embodiments of the present invention. The described embodiments are only some of the embodiments of the invention.

[0038] Such as figure 1 Shown: We adopt a two-step perception scheme, including precise perception and fast perception. Estimating the noise threshold is performed in the first step of the precise sensing cycle. Since the noise power remains constant in several minutes, the noise power estimated in the accurate sensing period can be used to set the threshold of the fast sensing period.

[0039] The specific steps in the precise perception stage are:

[0040] Step 1: Perform A / D conversion on the received signal y(t) with an accurate perception cycle, and obtain the sampling sample as Y 1 ,Y 2 ,...,Y K×M , and the corresponding sample value is Send the sample values ​​to the K×M grouper to get K gro...

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Abstract

The invention relates to a multi-threshold spectrum sensing method based on noise variance estimation. The method is intended to solve a problem of unstable energy detection performance in a noise variance uncertainty environment and comprises a two-step sensing scheme including precise sensing and fast sensing. First, in the first step of the precise sensing period, a maximum likelihood estimation method is used to estimate the noise power. Secondly, in the second step of the fast sensing period, the noise power estimated in the first step is used to adaptively set a plurality of decision thresholds to a cognitive user. Finally, the cognitive user performs energy detection according to the set decision thresholds to obtain a final judgment result. The multi-threshold spectrum sensing method can ensure good detection performance while a detector does not know a noise uncertainty interval, thereby overcoming an influence of noise uncertainty on the detection performance.

Description

technical field [0001] The invention relates to the field of wireless communication and signal detection, in particular to a multi-threshold spectrum sensing method based on noise variance estimation in a cognitive network. Background technique [0002] Cognitive Radio (CR), as a dynamic spectrum reuse technology, can improve spectrum utilization and effectively utilize resources, and its development has attracted extensive attention from academia and industry. In a cognitive wireless network, the cognitive user / secondary user (SU) first actively detects whether there is a primary user (PU) in the licensed spectrum. When there is no primary user in a specific frequency band, the cognitive device reconfigures its parameters to take advantage of spectral holes. When the PU appears again, the SU should release spectrum for the PU in time to reduce the interference to the PU. Therefore, the spectrum detection algorithm should have good reliability and fast detection speed. Co...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/382H04B17/345H04B1/00
CPCH04B17/382H04B1/0003H04B17/345
Inventor 文凯姜赖嬴杨丰瑞
Owner 重庆信科设计有限公司
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