The Journal of Korean Institute of Electromagnetic Engineering and Science (한국전자파학회논문지)

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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Efficient OFDM Frame Synchronization Scheme for LED-ID Systems

LED-ID 시스템을 위한 효율적인 OFDM 프레임 동기화 방식

  • Kim, Kyung-Ho (Department of Wireless Communications Engineering, Kwangwoon University) ;
  • Park, Young-Sik (Department of Wireless Communications Engineering, Kwangwoon University) ;
  • Hwang, Yu-Min (Department of Wireless Communications Engineering, Kwangwoon University) ;
  • Kim, Jin-Young (Department of Electronics Convergence Engineering, Kwangwoon University)
  • Received : 2013.12.10
  • Accepted : 2014.01.15
  • Published : 2014.04.30
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Abstract

In this paper, we propose an efficient OFDM(Orthogonal Frequency Division Multiplexing) frame synchronization scheme for LED-ID(Identification) systems. A frame synchronization is an essential procedure for normal operations of OFDM systems. Bernoulli-Gaussian noise is considered in LED-ID systems' environments. In order to enhance the OFDM frame synchronization performance, we add a ROGS(Repeated Orthogonal Gold Sequence) to OFDM signals in the time domain. The power level of a ROGS does not affect a normal operation of the LED-ID systems. Frame synchronization can be achieved successfully over LED-ID channels interfered by impulsive noise owing to good auto and cross-correlation properties of the ROGS.

본 논문에서는 LED-ID(Identification) 시스템을 위한 효율적인 프레임 동기화 방식을 제안한다. 프레임 동기화는 OFDM(Orthogonal Frequency Division Multiplexing) 시스템의 정상 동작을 위한 필수적인 절차이다. LED-ID 시스템 환경에서는 Bernoulli-Gaussian 잡음이 고려되어진다. OFDM 프레임 동기화 성능을 향상시키기 위해, 시간 영역에서 OFDM 신호에 반복 직교 골드 시퀀스(ROGS: Repeated Orthogonal Gold Sequence)를 추가했다. ROGS의 전력 레벨은 LED-ID 시스템의 정상 동작에 영향을 주지 않는다. ROGS의 우수한 자기상관 및 상호상관 성능 특성으로 인하여 임펄스 잡음 때문에 간섭이 있는 LED-ID 시스템 채널에서 프레임 동기화는 성공적으로 이루어진다.

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