Cooperative frequency spectrum sensing method for cognitive radio network

A cooperative spectrum sensing and cognitive radio technology, applied in the field of communication, can solve the problems of no significant improvement in perception diversity performance, neglect of diversity performance, loss of diversity gain, etc., and achieve low communication overhead, high diversity gain, false alarm rate and missed The effect of low detection rate

Inactive Publication Date: 2010-10-20
西安佳信系统集成有限责任公司
View PDF2 Cites 25 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing cooperative sensing technology lacks the research on fading channels and ignores the evaluation of diversity performance. The performance is not significantly improved; some methods require all cognitive users SU to transmit soft detection information to the fusion center (Fusion Center, information fusion center FC), which greatly increases the

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Cooperative frequency spectrum sensing method for cognitive radio network
  • Cooperative frequency spectrum sensing method for cognitive radio network
  • Cooperative frequency spectrum sensing method for cognitive radio network

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0050] The present invention is described in further detail below in conjunction with accompanying drawing:

[0051] First, create figure 1 Cognitive radio cooperative sensing system shown. Under this model, all cognitive users SU according to figure 2 process work. It is easy to prove that when the authorized user PU does not transmit signals, the received energy t of the nth cognitive user SU n (Given by equation (2)) obeys the central chi-square distribution with 2K degrees of freedom; and when the authorized user PU sends data, t n Follow a noncentral chi-square distribution. Citing the central limit theorem, when K is large enough, t n Approximately obeys a Gaussian distribution, that is,

[0052] t n ~ N ( K σ w 2 , ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a cooperative frequency spectrum sensing method for a cognitive radio network. The method comprises the following steps that: (1) the cognitive radio network which comprises N cognitive users SU and an information fusion center FC is configured in a network with an existing privileged user PU; (2) the cognitive user SU uses energy detection to independently judge whether aprivileged user PU signal is present, and transmits a binary hard decision result to the information fusion center FC, and the transmitting power of the cognitive user is adaptively adjusted according to the condition of a channel from the privileged user PU to the cognitive user SU; and (3) the information fusion center FC fuses the results of a plurality of cognitive users SU by adopting a maximum likelihood detector, and finally determines whether the privileged user PU is occupying the frequency spectrum. The cognitive user SU can independently process the signal without transmitting softinformation or interchanging information; and a detector in the information fusion center FC has a simple structure and is easy to implement. Meanwhile, the cooperative frequency spectrum sensing method has good performance such as low communication overhead, high diversity gain, low false alarm rate and lost detection rate and the like, and has high practical value.

Description

Technical field: [0001] The invention belongs to the field of communications, and relates to a spectrum sensing method, in particular to a spectrum sensing method for a cognitive radio network, and in particular to a collaborative technology-based spectrum sensing and its signal transmission and processing method. Background technique: [0002] With the rapid development of wireless communication services, existing networks are facing a contradiction between the scarcity of wireless spectrum resources and the increasing demand for spectrum resources by various services. Cognitive Radio (CR) uses the temporarily unused frequency band allocated to authorized users (Primary User, authorized user PU), that is, spectrum holes, to assist cognitive users (also known as secondary users, Secondary User , SU) transmits information, which opens up a new way to improve spectrum utilization, and has become a research hotspot in recent years, and it is also a key technology of the relevan...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H04B17/00H04B1/707H04B17/382
Inventor 李国兵朱世华廖学文惠鏸张国梅
Owner 西安佳信系统集成有限责任公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap