The Journal of Korean Institute of Communications and Information Sciences (한국통신학회논문지)

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Uplink Frequency Offset Compensation Scheme for High-Speed Moving Terminals

고속 이동체를 위한 상향링크 주파수 옵셋 보상 방법

  • Choi, Sung-woo (Electronics and Telecommunications Research Institute, Chungnam National University Department of Information and communication) ;
  • Kim, Ilgyu (Electronics and Telecommunications Research Institute) ;
  • Ahn, Jae Min (Chungnam National University Department of Information and communication)
  • Received : 2015.08.13
  • Accepted : 2015.09.03
  • Published : 2015.09.30
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Abstract

Moving terminals like high-speed-train undergo high Doppler frequency shift, and this leads to carrier frequency offsets that have to be compensated to avoid degradation of communication performance. In multiple access mechanism like OFDMA, base-stations need complex hardware to compensate the uplink frequency offset. In this paper, we propose a method, which can reduce burden of the base-station and makes frequency offset estimation and compensation simple. This method contains transmitting new synchronization signal, estimating frequency offsets in base-station, transmitting feedback information to terminal, and compensating the offset in uplink transmission. Simulation results show the proposed method operates well in high Doppler frequency shift conditions of 500 km/h which is the requirements of 5G mobile communication.

고속열차와 같은 이동체는 높은 도플러 주파수 천이가 발생하고, 이에 따라 높은 캐리어 주파수 옵셋이 생겨서 이를 보상하지 않으면 통신 성능의 열화를 가져온다. OFDMA 방식의 다중 단말 접속 방식에서 기지국이 상향링크 주파수 옵셋을 보상하기 위해서 복잡한 하드웨어가 필요하다. 본 논문은 기지국의 부담을 줄이고, 간단하게 주파수 옵셋 추정 및 보상을 하기 위한 방법을 제안한다. 제안한 방법은 주파수 옵셋 보상을 위해 하드웨어로 단말은 추가로 곱셈기 하나만 필요하여, 기지국 직접 보상에 비해서 많은 하드웨어를 감소시킬 수 있다. 제안한 방법은 밀리미터 통신 기반 고속철도 통신 시스템 환경에서 시뮬레이션을 수행하였다. 시뮬레이션을 통해서 제안한 방법이 5G 이동통신의 요구사항인 500 km/h 속도의 높은 도플러 주파수 천이 상황에서도 효과적으로 동작함을 확인 하였다.

Keywords

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