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

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Median Prefilter Based Robust Acquisition Of Direct Sequence Spread Spectrum Signals In Wideband Pulse Jamming

미디언 필터를 이용한 광대역 펄스 재밍 환경에서의 직접 시퀀스 확산 대역 신호의 강인한 포착

  • 김승준 (서울대학교 공과대학 전기공학부 신호전송연구실 정회원) ;
  • 이용환 (서울대학교 공과대학 전기공학부 신호전송연구실 정회원)
  • Published : 1999.06.01
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Abstract

We propose nonlinear processing schemes for robust acquisition of direct-sequence spread spectrum (DS/SS) signals in wideband pulse jamming. To mitigate the interference effect due to impulse-like wideband jamming signals, the received signal is preprocessed by using the median filter, a simple order statistic filter Since only parts of the PN sequence are used for rapid acquisition, it is indispensable for analytic design of an acquisition scheme to have an appropriate model of the partial PN signal. The partial correlation of the median filtered PN signal is approximated by a two-piecewise linear model using an approximate upper bound. The acquisition performance of the proposed schemes is compared to that of other schemes. Finally, the analytic design is verified by computer simulation.

본 논문에서는 임펄스성 광대역 재밍 환경에서 직접 시퀀스 확산 대역(direct-sequence spread spectrum: DS/SS) 신호를 강인하게 포착하는 기법을 제안한다. 광대역 재밍 신호의 영향을 완화하기 위하여 미디언(median) 필터를 이용하여 수신 신호를 전처리한다. 빠른 포착을 위해서는 PN 시퀀스의 일부만으로 포착 여부를 판정해야 하므로, 포착기를 분석적으로 설계하기 위해서는 PN 시퀀스의 부분 상관 함수에 대한 적절한 모델이 필요하다. 본 논문에서는 미디언 필터로 처리한 PN 신호의 부분 상관 함수를 근사적인 상한을 이용하여 조각적 선형 모델로 모델링한다. 제안된 포착 방식의 성능을 기존의 방법과 비교하여 전산 모의 실험을 통해 분석적인 설계 방법을 검증한다.

Keywords

References

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