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Clustering frequency spectrum perception method based on energy consumption in cognitive sensor network

A sensor network and spectrum sensing technology, applied in network planning, network topology, and energy reduction, etc., can solve the problems of consuming cognitive node energy, short cognitive network survival time, and fast cognitive network energy consumption.

Active Publication Date: 2012-04-11
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

In order to solve the problem of hidden terminals, the number of cooperative sensing users must be sufficient, but participating in the detection will consume the energy of cognitive nodes. The more nodes participating in cooperative sensing, the faster the energy consumption of the cognitive network, and the survival time of the cognitive network shorter

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  • Clustering frequency spectrum perception method based on energy consumption in cognitive sensor network
  • Clustering frequency spectrum perception method based on energy consumption in cognitive sensor network
  • Clustering frequency spectrum perception method based on energy consumption in cognitive sensor network

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Embodiment Construction

[0026] Assume that the signal power of the primary user is P u , The acceptance signal of user i is P i , And there is P i = Β i P u , The received signal-to-noise ratio of cognitive user i is:

[0027] γ i = P i σ 2 = β i P u σ 2 , i = 1,2 , . . . , N - - - ( 1 )

[0028] Where β i The power attenuation factor transmitted from the main user signal to the cognitive user i, σ 2 Is the Gaussian white noise power. Assuming that the channel is a Rayleigh fading channel at this time, the SNR of the cognitive user also obeys the average SNR as Exponential distribution, that is, the probability density function of the cognitive user’s received signal-to-noise ratio satisfies among them It is the average signal-to-noise ratio of the primary user signal received by the cognitive user in the entire cognitive sensor network.

[0029] When the number of cognitive users of the cognitive sensor network is quite ...

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Abstract

The invention provides a clustering frequency spectrum perception method based on energy consumption in a cognitive sensor network. In the method, an LEACH clustering algorithm based on node energy is introduced. Firstly, the each node in the cognitive sensor network is divided into several clusters according to the clustering algorithm. Then, in the each cluster, a utility function, which can taken detection performance and energy consumption into consideration, is constructed. Based on the utility function, an optimum cooperation user number and a user are selected so that the detection performance and the energy consumption can reach a good compromise in the each cluster. Finally, an OR rule is used on a sink node so as to fuse perception information sent by a cluster head and then a final decision result can be obtained. By using the method of the invention, survival time of the cognitive sensor network can be effectively prolonged. Energy consumption of the network can be saved and the good detection performance can be guaranteed.

Description

Technical field [0001] The invention relates to a spectrum sensing method especially used for cognitive sensor networks, and belongs to the field of communication technology. Background technique [0002] Cognitive radio is a technology that improves spectrum utilization. It allows the secondary network (user) to borrow unused wireless spectrum from the primary authorized network (user), or use the spectrum with the primary authorized network (user). As an intelligent wireless communication system, one of the most critical parts of cognitive radio technology is spectrum sensing. Cognitive radio must constantly perceive the frequency band it uses to detect whether the main user is using this frequency band. Once the primary user is detected, cognitive radio must immediately withdraw the secondary user from this frequency band to minimize the possible interference to the primary user. The purpose of cognitive radio aimed at improving spectrum utilization makes it applicable in ma...

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Application Information

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IPC IPC(8): H04B17/00H04W16/14H04W84/18H04L25/02H04B17/382
CPCY02B60/50Y02D30/70
Inventor 朱琦张丽红朱洪波杨龙祥
Owner NANJING UNIV OF POSTS & TELECOMM
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