The Journal of The Korea Institute of Intelligent Transport Systems (한국ITS학회 논문지)

The Korea Institute of Intelligent Transport Systems (한국ITS학회)
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A Spectrum Sensing Scheme with Unknown Deterministic Signal Environment

예측 가능한 신호 환경에서의 스펙트럼 센싱 기법

  • 김정훈 (인하대학교 정보통신대학원) ;
  • 이크발 아시프 (인하대학교 정보통신대학원) ;
  • 골미라 (인하대학교 정보통신공학부) ;
  • 곽경섭 (인하대학교 정보통신공학부, 인하대학교 초광대역무선통신연구센터)
  • Received : 2011.03.17
  • Accepted : 2011.04.26
  • Published : 2011.06.30
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Abstract

Spectrum sensing is one of the most important technologies in cognitive radio. Although many studies have considered energy detection technique as the spectrum sensing technique, noise variance in practical systems is difficult to estimate accurately. Thus, in the real system, the probability of false alarm will not be maintained constant. In this paper, with considering that the cognitive radio does not know the primary user's signal, we propose a new spectrum sensing scheme which can operate without the information of noise variance. Through simulations, we show that the proposed scheme can detect spectrum with the condition of unknown noise information and have robustness for the change of noise variance.

스펙트럼 센싱은 인지 라디오에서 가장 핵심이 되는 기술이다. 이미 여러 논문에서 에너지 검출기를 바탕으로 하는 스펙트럼 센싱 기법들에 대해 연구하였지만, 실제 시스템에서는 노이즈의 분산을 정확히 추정하는 것이 어려우므로 에너지 검출기를 쓰면 시스템이 요구하는 오경보 확률을 유지할 수 없는 문제가 생긴다. 이에 본 논문에서는, 인지 라디오가 예측 가능하지만 알지 못하는 주사용자의 신호를 검출해야 할 때 노이즈의 분산을 몰라도 스펙트럼을 검출할 수 있는 새로운 검출기를 제안한다. 시뮬레이션을 통해 제안한 검출기는 노이즈의 분산을 몰라도 스펙트럼을 검출할 수 있으며 노이즈 분산의 변화에 강인한 특성을 지닌다는 것을 보인다.

Keywords

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