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A Cooperative Spectrum Sensing Approach in Cognitive Networks

A spectrum sensing and cognitive network technology, applied in transmission monitoring, electrical components, transmission systems, etc., can solve the problems of no mechanism to guarantee the environmental parameters of secondary users, difficult implementation, etc., to increase feasibility and robustness, eliminate prior Reliance on empirical knowledge, effect on perceived performance

Inactive Publication Date: 2015-10-28
SHANGHAI JIAOTONG UNIV
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Problems solved by technology

In actual operation, this process is difficult to implement, and there is no mechanism to ensure that secondary users will report their real environmental parameters to the control center

Method used

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  • A Cooperative Spectrum Sensing Approach in Cognitive Networks
  • A Cooperative Spectrum Sensing Approach in Cognitive Networks
  • A Cooperative Spectrum Sensing Approach in Cognitive Networks

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Embodiment Construction

[0038] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0039] As described in the background, cooperative sensing is widely used in the spectrum sensing technology in the cognitive radio system to overcome the interference caused by multipath effect and fading suffered by a single secondary user when performing spectrum sensing. The quantitative fusion technology in collaborative sensing has found a better compromise between transmission efficiency and detection performance. However, the optimal fusion strategy often requires some prior knowledge of t...

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Abstract

The invention relates to a cooperation type frequency spectrum sensing method in a cognitive network. The cooperation type frequency spectrum sensing method in the cognitive network comprises a training stage, a sensing stage and a frequency spectrum sharing stage, wherein the training stage comprise the steps that a user is authorized to switch between an active state and an idle state according to a prescribed mode, secondary users carry out frequency spectrum frequency spectrum sensing through energy detection, local sensing data are sent to a control center by the secondary users, and the control center solves the optimum weight vector needed by data fusion in cooperation type frequency spectrum sensing; the sensing stage comprises the steps that the user is authorized to act freely, energy detection is carried out on a frequency spectrum by the secondary users, detection data are then sent to the control center, and the control center judges the acting condition of the currently authorized user according to an existing weight matrix and a threshold; the frequency spectrum sharing stage comprises the steps that when the control center judges that the authorized user is in an idle state during the time slot, the transmission time on the channel distributed to each secondary user is determined by the control center according to the distribution made by the secondary users to sensing. The cooperation type frequency spectrum sensing method in the cognitive network has the advantages that feasibility and robustness of the system are improved, and good sensing performance is achieved.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a cooperative spectrum sensing method in a cognitive network. Background technique [0002] Due to the rapid increase in demand for wireless services in recent years, the demand for wireless spectrum in the industry is also increasing, resulting in a shortage of spectrum resources. But at the same time, the utilization rate of the licensed frequency band has not been high. Cognitive radio technology is recognized as capable of improving spectrum utilization efficiency. In general, a cognitive radio network can enable secondary users (SU, secondary user) and authorized users (PU, primary user) to share spectrum resources to transmit their data. The basic implementation method is that the secondary user transmits through a spectrum hole that does not exist in the authorized communication system, or the secondary user restricts its own transmission so as not to i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B17/382
Inventor 徐闻筠孙高飞冯心欣田晓华甘小莺王新兵
Owner SHANGHAI JIAOTONG UNIV
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