Journal of the Institute of Electronics Engineers of Korea TC (대한전자공학회논문지TC)

The Institute of Electronics and Information Engineers (대한전자공학회)
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Performance Analysis of Cognitive Relay Networks with Multiple Primary Users

다수의 주 사용자가 존재하는 무선인지 네트워크의 중계 전송 성능 평가

  • Lee, Je-Min (School of Electrical and Electronic Enginnering, Yonsei University) ;
  • Wang, Han-O (School of Electrical and Electronic Enginnering, Yonsei University) ;
  • Noh, Go-San (School of Electrical and Electronic Enginnering, Yonsei University) ;
  • Hong, Dae-Sik (School of Electrical and Electronic Enginnering, Yonsei University)
  • 이제민 (연세대학교 전기전자공학부) ;
  • 왕한호 (연세대학교 전기전자공학부) ;
  • 노고산 (연세대학교 전기전자공학부) ;
  • 홍대식 (연세대학교 전기전자공학부)
  • Received : 2010.03.16
  • Published : 2010.05.25
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Abstract

This paper evaluates the outage probability of cognitive relay networks with cooperation between secondary users based on the underlay approach, when multiple primary receivers coexist with secondary users. Using an appropriate relay selection criterion in cognitive radio networks, we derive the outage probability of secondary user. It is shown that the outage probability increases as the number of primary receivers increases and we quantify the increase. Through the simulation results, we verify that the performance of relaying transmission is varied more sensitively compared to that of direct transmission as the number of primary receivers increases. In addition, the relaying transmission can be less efficient than the direct transmission when multiple primary receiver exist but it can be more efficient than the direct transmission by increasing the relay selection diversity.

본 논문은 underlay 기법으로 다수의 주 사용자 수신기들(primary receivers)이 부 사용자들(secondary users)과 공존할 때 부 사용자들의 협력을 통한 중계 전송의 성능을 평가하였다. 무선 인지 환경에 적합한 중계기 선택 기준을 사용하였을 때 부 사용자의 outage probability를 유도하였다. 이러한 분석을 통하여, 공존하는 다수의 주 사용자들로 인하여 증가하는 부 사용자의 outage probability 양을 정량적으로 표현하였다. 모의실험을 통하여, 주 사용자의 개수가 증가할수록 중계 전송이 직접 정송에 비하여 민감하게 성능이 감소하고, 이로 인하여 중계 전송이 직접 전송에 비하여 비효율적일 수 있음을 보여주었다. 또한, 비록 다수의 주 사용자가 존재하더라고 중계기 선택의 다이버시티를 늘려 줌으로서 중계 전송이 직접 전송보다 효율적일 수 있음을 확인하였다.

Keywords

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