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

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Symbol Error Probability of DVB-S2 System with I/Q Unbalances

I/Q 불균형이 고려된 DVB-S2 시스템의 심벌 오류 확률

  • 임인철 (삼성전자 정보통신총괄) ;
  • 원승찬 (삼성전자 정보통신총괄) ;
  • 윤동원 (한양대학교 전자통신컴퓨터공학부) ;
  • 박상규 (한양대학교 전자통신컴퓨터공학부)
  • Published : 2007.09.30
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Abstract

The I/Q unbalance which is generated by non-ideal components such as a $90^{\circ}$ phase shifter and I/Q filters is an inevitable physical phenomenon and leads to performance degradation when we implement a coherent two-dimensional (2-D) modulation/demodulation system. This paper provides an exact and general expression for the SEP(symbol error probability) of DVB-S2 system with I/Q phase and amplitude unbalance over AWGN channel. Coordinate rotation and shift techniques used to redefine a received signal are key mathematical tools. In conclusion, the derived result is expressed as a linear combination of the 2-D Gaussian Q-functions.

90도 위상 천이기나 필터와 같은 불완전한 시스템 요소에 의해 생성되는 I(inphase)축과 Q(quadrature)축 간의 불균형은 피할 수 없는 물리적 현상으로 동기 변/복조 시스템(coherent modulation/demodulation system) 구현에 있어서 성능 열화를 유발한다. 본 논문에서는 AWGN (additive white Gaussian noise) 채널 환경에서 수신기의 I/Q 불균형이 존재하는 경우, DVB(digital video broadcasting)-S2 시스템에서 사용되는 변조방식에 대한 정확하고 일반화된 심벌 오류 확률을 2차원 결합 가우시안 Q-함수(two-dimensional joint Gaussian Q-function)의 선형 결합(linear combination)의 형태로 유도한다.

Keywords

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