주파수 공간 블록 부호화된 단일 측대 파형 SC FDMA 전송 시스템

Space-Frequency Block Coded Single Side Band SC-FDMA Transmission System

  • 원희철 (대구대학교 컴퓨터정보공학부)
  • Won, Hui-Chul (Division of Computer and Information Engineering, Daegu University)
  • 투고 : 2019.04.08
  • 심사 : 2019.07.05
  • 발행 : 2019.07.31


최근에 초고속 광대역 무선통신 전송 시스템의 수신 성능 개선을 위한 다양한 기술들이 제안되고 있다. 본 논문에서는 주파수 공간 블록 부호화된 단일 측대 파형 SC (Single Carrier) FDMA (Frequency Division Multiple Access) 전송 시스템을 제안한다. 본 논문에서 제안된 주파수 공간 블록 부호화된 단일 측대 파형 SC FDMA 전송 시스템에서는 PAM (Pulse Amplitude Modulation) 신호의 DFT (Discrete Fourier Transform) 확산에 따라 생성되는 켤레 복소수 대칭을 활용하여 주파수 공간 블록 부호를 구현한다. 이를 통해 시스템 계산 복잡도를 크게 증가시키지 않으면서 단일 측대 파형 SC FDMA 전송 시스템의 성능 개선을 위한 송신 다이버시티 이득을 획득할 수 있다. 본 논문에서 제안된 주파수 공간 블록 부호화 단일 측대 파형 SC FDMA 시스템의 신호 대 잡음 비 성능이 단일 안테나 기반의 단일 측대 파형 SC FDMA 시스템보다 $10^{-2}$ 심볼 오류율 수준에서 약 4 dB 이상 개선되는 것을 실험을 통해 확인할 수 있다.

Recently, a variety of methods for the performance improvement of ultra-high speed wideband wireless transmission systems have been suggested. This paper proposes a space-frequency (SF) block coded single side band (SSB) single carrier (SC)-frequency division multiple access (FDMA) transmission system. In the proposed SSB SC-FDMA system, SF block code is implemented with the complex conjugates, which are formed from discrete Fourier transform (DFT) spreading of pulse amplitude modulation (PAM) signals. As a result, transmit diversity gain can be obtained in the proposed SF block coded SSB SC-FDMA system without any significant increase of the system computational complexity. The simulation result shows that the signal-to-noise power ratio (SNR) performance of the proposed SF block coded SSB SC-FDMA system is approximately 4 dB better than the SNR performance of the conventional SSB SC-FDMA system with single transmit antenna at a symbol error rate (SER) of $10^{-2}$.

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Fig. 1. Space-Frequency block code

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Fig. 2. The characteristic of symbols spreaded after DFT

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Fig. 3. DFT spreading SSB OFDM system

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Fig. 4. SSB SC-FDMA system with no diversity

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Fig. 5. Proposed SF block coded SSB SC-FDMA system

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Fig. 6. SF block coding with LSB signals (e.g. M=64)

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Fig. 7. SF block coding with USB signals (e.g. M=64)

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Fig. 8. Bit error rate performance

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Fig. 9. Symbol error rate performance


연구 과제 주관 기관 : 대구대학교


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