Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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Space-Frequency Block Coded Relay Transmission System for a Shadow Area

음영 지역을 위한 주파수 공간 블록 부호화 중계기 전송 시스템

  • Won, Hui-Chul (Division of Computer & Information Technology, Daegu University)
  • 원희철 (대구대학교 컴퓨터.IT공학부)
  • Received : 2014.05.27
  • Accepted : 2014.09.11
  • Published : 2014.09.30
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Abstract

Relay-assisted wireless communication systems have been studied widely to cope with shadow areas and extend the cell coverage. This paper proposes a space-frequency (SF) block coded single carrier-frequency division multiple access (SC-FDMA) transmission system in a relaying multi-path shadow area and present the performance comparison of SC-FDMA systems based on the signal-to-noise power ratio (SNR) between a relay and a destination station. The performance of relaying SC-FDMA systems can be improved by applying SF block code to the recovered signals of relays before re-transmitting them. The simulation result showed that the SNR performance of the proposed SF block coded relaying SC-FDMA system was approximately 5 dB better than the SNR performance of the single-path relaying SC-FDMA system at a symbol error rate (SER) of $10^{-2}$.

음영 지역 해소 및 셀 커버리지 확대를 위하여 중계기를 활용하는 이동 통신 시스템이 널리 연구되고 있다. 본 논문에서는 중계기를 통해 다중 경로가 확보된 음영 지역에서 주파수 공간 블록 부호를 적용한 SC-FDMA(Single Carrier-Frequency Division Multiple Access) 전송 시스템을 제안하고, 중계기와 수신국 간의 신호 대 잡음 비를 기준으로 음영 지역을 위한 SC-FDMA 시스템의 성능을 비교한다. 중계기에서 복원된 전송 신호에 대하여 주파수 공간 블록 부호를 적용하여 재전송함으로서 중계기 기반 SC-FDMA 시스템의 수신 성능을 크게 향상시킬 수 있다. 본 논문에서 제안된 주파수 공간 블록 부호화 중계기 기반 SC-FDMA 시스템의 신호 대 잡음 비 성능이 단일 중계기 기반 SC-FDMA 시스템보다 $10^{-2}$ 심볼 오류율 수준에서 약 5 dB 개선됨을 실험을 통해 확인할 수 있다.

Keywords

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