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

The Korea Institute of Information and Commucation Engineering (한국정보통신학회)
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A Study of Efficient Viterbi Equalizer in FTN Channel

FTN 채널에서의 효율적인 비터비 등화기 연구

  • Kim, Tae-Hun (Department of Radio Communication Engineering, Korea Maritime and Ocean University) ;
  • Lee, In-Ki (Satellite and Wireless Convergence Research Department, Electronics and Telecommunications Research Institute) ;
  • Jung, Ji-Won (Department of Radio Communication Engineering, Korea Maritime and Ocean University)
  • Received : 2014.02.21
  • Accepted : 2014.04.04
  • Published : 2014.06.30
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Abstract

In this paper, we analyzed efficient decoding scheme with FTN (Faster than Nyquist) method that is transmission method faster than Nyquist theory and increase the throughput. we proposed viterbi equalizer model to minimize ISI (Inter-Symbol Interference) when FTN signal is transmitted. the proposed model utilized interference as branch information. In this paper, to decode FTN singal, we used turbo equalization algorithms that iteratively exchange probabilistic information between soft Viterbi equalizer (BCJR method) and LDPC decoder. By changing the trellis diagram in order to maximize Euclidean distance, we confirmed that performance was improved compared to conventional methods as increasing throughput of FTN signal.

본 논문은 인접 심볼 간의 간섭이 발생하지 않는 최대 데이터 전송률인 Nyquist rate 보다 빠르게 데이터를 전송하여 전송량을 증가시키는 FTN(Faster than Nyquist) 기법을 이용하여 효율적인 복호 방식을 분석한다. FTN 신호 전송시 발생하는 ISI(Inter-Symbol Interference) 를 최소화하기 위해 간섭량을 비터비 등화기의 가지 정보로 활용하여 비터비 등화기 모델을 제안한다. 본 논문에서는 FTN 신호를 복호하기 위해 BCJR 기법을 이용한 비터비 등화기와 LDPC 복호기간의 반복으로 이루어진 터보 등화 기법을 이용하여 복호한다. BCJR 복호시 트렐리스 구조를 본 논문에서는 유클리디언 거리를 최대로 함으로써 기존의 방식보다 성능이 향상됨을 알 수 있으며, 이에 따른 FTN 신호의 전송량 증가별 성능을 비교한다.

Keywords

References

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