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

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Spectrum Analysis and Performance Evaluation of OFDM-Single-Side Band Systems Based on BPSK Modulation

BPSK 변조 기반의 OFDM-Single Side Band 시스템의 스펙트럼 분석 및 성능 평가

  • Kim, Byeongjae (Department of Electronic Engineering, Chungbuk National University) ;
  • Ryu, Heung-Gyoon (Department of Electronic Engineering, Chungbuk National University)
  • Received : 2016.06.16
  • Accepted : 2016.10.27
  • Published : 2016.11.30
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Abstract

In this paper, we propose and evaluate OFDM(Orthogonal Frequency Division Multiplexing)-SSB(Singe Side Band) for improving spectral efficiency. The proposed system is based on OFDM system using DCT(Discrete Cosine Transform) and DHT(Discrete Hilbert Transform) for SSB modulation, this proposed system transmit a BPSK modulation signal through a single sideband and BPSK modulation signal through the other single sideband. In other words, we design and evaluate the proposed system which transmit two BPSK signal through each other single sideband. Also each BPSK BER performance is similar with theoretical BPSK BER performance. the proposed system transmits BPSK signal using half of spectrum of conventional OFDM system or transmit two BPSK signal in same time.

본 논문에서는 BPSK변조를 사용하는 OFDM(Orthogonal Frequency Division Multiplexing)기반의 시스템에서 2 branch로 나눈 후에 DCT(Discrete Cosine Transform)를 사용하고 DHT(Discrete Hilbert Transform)와 복소수를 이용하여 스펙트럼을 변화시켜 SSB(Singe Side Band) 전송과 같은 효과를 내는 시스템 모델을 제시하고 성능을 평가한다. 또한 제안하는 시스템은 한 정보신호를 SSB전송과 같이 절반의 스펙트럼으로 송신을 할 뿐만 아니라 전체의 스펙트럼을 양측파대라 할 때 양측파대 중 한쪽의 단측파대를 통해 BPSK 변조된 하나의 정보신호를 다른쪽의 단측파대를 통해 다른 BPSK 변조된 정보신호를 동시에 송신하고 수신기에는 하나의 OFDM시스템의 신호처럼 들어온 신호에서 양측파대 각각에서 정보신호를 구분 복조 한다. 또한 각각의 복조된 BPSK 신호는 이론적인 BPSK신호와 거의 유사한 BER 성능을 보인다. 즉 제안하는 시스템 모델은 하나의 BPSK신호를 절반의 스펙트럼만을 사용하여 송신하거나 혹은 두 BPSK신호를 동시에 송신 할 수 있다.

Keywords

References

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