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IEICE Transactions on Communications 2008 E91-B(1):70-76; doi:10.1093/ietcom/e91-b.1.70
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Copyright © 2008 The Institute of Electronics, Information and Communication Engineers

Special Section on Cognitive Radio and Spectrum Sharing Technology -- Papers -- Spectrum Sensing

Interference Information Based Power Control for Cognitive Radio with Multi-Hop Cooperative Sensing

Youngjin YU1, Hidekazu MURATA1, Koji YAMAMOTO 1 and Susumu YOSHIDA 1

1 The authors are with the Graduate School of Informatics, Kyoto University, Kyoto-shi, 606-8501 Japan. E-mail: contact-h19{at}hanase.kuee.kyoto-u.ac.jp


  Abstract

Reliable detection of other radio systems is crucial for systems that share the same frequency band. In wireless communication channels, there is uncertainty in the received signal level due to multipath fading and shadowing. Cooperative sensing techniques in which radio stations share their sensing information can improve the detection probability of other systems. In this paper, a new cooperative sensing scheme that reduces the false detection probability while maintaining the outage probability of other systems is investigated. In the proposed system, sensing information is collected using multi-hop transmission from all sensing stations that detect other systems, and transmission decisions are based on the received sensing information. The proposed system also controls the transmit power based on the received CINRs from the sensing stations. Simulation results reveal that the proposed system can reduce the outage probability of other systems, or improve its link success probability.

Key Words: cognitive radio, cooperative sensing, shadowing, interference information, multi-hop transmission

Manuscript received May 7, 2007. Manuscript revised July 20, 2007.


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