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Wireless Personal Communications

, Volume 72, Issue 1, pp 283–298 | Cite as

Sensing Confidence Level-Based Joint Spectrum and Power Allocation in Cognitive Radio Networks

  • Guoru Ding
  • Qihui Wu
  • Jinlong Wang
Article

Abstract

Cognitive radio (CR) has been extensively investigated in the past decade to tackle the contradiction between wireless spectrum shortage and underutilization. In this paper, we present a unified analytical framework to design PHY-layer spectrum sensing and MAC-layer resource scheduling jointly for CR networks. A key parameter, named sensing confidence level (SCL), is introduced to characterize the presence of imperfect sensing, and bridge the designs between kinds of spectrum sensing schemes and resource allocation algorithms. The SCL-based joint design of spectrum and power allocation is formulated as a mixed integer non-linear optimization problem and Lagrange duality theory is introduced to make the problem tractable. The proposed joint design framework in this paper provides a baseline for comparing different spectrum sensing schemes plus bandwidth and power allocation algorithms. Numerical results demonstrate the effectiveness of the proposed framework.

Keywords

Cognitive radio Sensing confidence level Spectrum sensing  Resource allocation Joint design 

Abbreviations

CSS

Cooperative spectrum sensing

CR

Cognitive radio

PN

Primary network

CRN

Cognitive radio network

SU

Secondary user

PU

Primary user

SSI

Soft sensing information

HSI

Hard sensing information

RSI

Raw sensing information

SBS

secondary base station

LHGH

Local one-bit hard decision and global one-bit hard decision

LHGS

Local one-bit hard decision and global soft fusion

LSGS

local soft sensing and global soft fusion

CSI

Channel state information

SCL

Sensing confidence level

SEP

Sensing error percentage

Notes

Acknowledgments

The authors would like to thank the associate editor and the anonymous reviewers for their precious time and constructive comments, which have greatly improved the quality of this article. This work was supported in part by the National Basic Research Program of China (No. 2009CB320400), the National Natural Science Foundation of China (Nos. 60932002 and 6117206), and the Natural Science Foundation of Jiangsu, China (No. BK2011116).

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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  1. 1.College of Communications EngineeringPLA University of Science and TechnologyNanjingChina

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