Journal of the Korea Institute of Information and Communication Engineering (한국정보통신학회논문지)

The Korea Institute of Information and Commucation Engineering (한국정보통신학회)
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Detection algorithm for DAA using Decision Directed method in MB-OFDM

MB-OFDM에서 충돌회피를 위한 결정궤환방식의 간섭신호 검출 기법

  • Received : 2011.01.17
  • Accepted : 2011.01.28
  • Published : 2011.02.28
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Abstract

Since the MB-OFDM(Multi-Band Orthogonal Frequency Division Multiplexing) is an ultra wideband communication system operated on ISM(Industrial, Scientific and Medical) band, DAA(Detect-And-Avoid) is required for co-existence with the other communication service. In this paper we propose the new detection algorithm based on decision-feedback, which shows faster convergence time and less complexity than previous works. The proposed algorithm detects interference above -20dB in AWGN(Additive White Gaussian Noise) and LOS(Line-Of-Sight) channel, and close to AWGN in non-LOS channel under appropriate channel clipping.

MB-OFDM(Multi-Band Orthogonal Frequency Division Multiplexing)은 ISM(Industrial, Scientific and Medical) 대역을 사용하는 초 광대역 통신으로 기존 통신 시스템과 공존하기 위해서 검출 및 회피 기법인 DAA(Detect-And-Avoid)을 사용하는 것이 요구되고 있다. 본 논문에서는 DAA를 위한 간섭신호 검출 방식으로 결정궤환 방식을 제안하여 기존의 방법에 비하여 수렴 속도가 빠르고 간단히 구현할 수 있는 특징을 갖고 있다. 제안된 방식은 AWGN(Additive White Gaussian Noise), 및 LOS(Line-Of-Sight)채널에서는 -20dB의 간섭까지 검출하는 우수한 성능을 보이고 있다. 또한 비 LOS 채널에서는 적절한 채널 클리핑을 통하여 AWGN 채널에 근사한 성능을 제시하였다.

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References

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