Journal of Broadcast Engineering (방송공학회논문지)

The Korean Institute of Broadcast and Media Engineers (한국방송∙미디어공학회)
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Detection Scheme Based on Gauss - Seidel Method for OTFS Systems

OTFS 시스템을 위한 Gauss - Seidel 방법 기반의 검출 기법

  • Cha, Eunyoung (Interdisciplinary Major of Maritime AI Convergence, Department of Electronics and Communications Engineering, Korea Maritime and Ocean University) ;
  • Kim, Hyeongseok (Interdisciplinary Major of Maritime AI Convergence, Department of Electronics and Communications Engineering, Korea Maritime and Ocean University) ;
  • Ahn, Haesung (Interdisciplinary Major of Maritime AI Convergence, Department of Electronics and Communications Engineering, Korea Maritime and Ocean University) ;
  • Kwon, Seol (Interdisciplinary Major of Maritime AI Convergence, Department of Electronics and Communications Engineering, Korea Maritime and Ocean University) ;
  • Kim, Jeongchang (Interdisciplinary Major of Maritime AI Convergence, Department of Electronics and Communications Engineering, Korea Maritime and Ocean University)
  • 차은영 (한국해양대학교 전자통신공학과 해양인공지능융합전공) ;
  • 김형석 (한국해양대학교 전자통신공학과 해양인공지능융합전공) ;
  • 안해성 (한국해양대학교 전자통신공학과 해양인공지능융합전공) ;
  • 설권 (한국해양대학교 전자통신공학과 해양인공지능융합전공) ;
  • 김정창 (한국해양대학교 전자통신공학과 해양인공지능융합전공)
  • Received : 2021.12.21
  • Accepted : 2022.02.16
  • Published : 2022.03.30
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Abstract

In this paper, the performance of the decoding schemes using linear MMSE filters in the frequency and time domains and the reinforcement Gauss-Seidel algorithm for the orthogonal time frequency space (OTFS) system that can improve robustness under high-speed mobile environments are compared. The reinforcement Gauss-Seidel algorithm can improve the bit error rate performance by suppressing the noise enhancement. The simulation results show that the performance of the decoding scheme using the linear MMSE filter in the frequency domain is severely degraded due to the effect of Doppler shift as the mobile speed increases. In addition, the decoding scheme using the reinforcement Gauss-Seidel algorithm under the channel environment with 120 km/h and 500 km/h speeds outperforms the decoding schemes using linear MMSE filters in the frequency and time domains.

본 논문에서는 고속 이동환경에서 강건성을 향상시킬 수 있는 OTFS(orthogonal time frequency space) 시스템에서 주파수 및 시간영역에서의 선형 MMSE(minimum mean squared error) 필터를 이용한 디코딩 알고리즘과 강화된 Gauss-Seidel 알고리즘을 이용한 디코딩 알고리즘의 성능을 비교한다. 강화된 Gauss-Seidel 알고리즘은 잡음 증폭을 억제함으로써 비트 오류율 성능을 개선할 수 있다. 전산 실험 결과를 통해 주파수 영역에서 MMSE 필터를 이용한 디코딩 알고리즘은 수신기의 이동 속도가 높아짐에 따라 성능 열화가 발생하는 것을 확인할 수 있고, 강화된 Gauss-Seidel 알고리즘을 이용한 디코딩 방법은 120km/h 속도와 500km/h 속도를 가지는 채널 환경에 대해 주파수 영역 및 시간 영역에서의 MMSE 필터 디코딩 알고리즘에 비해 우수한 성능을 나타내는 것을 확인할 수 있다.

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References

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