An FFT interference detection scheme for interference suppression in digital satellite communication systems

Takatoshi Sugiyama, Masanobu Suzuki, Shuji Kubota

Research output: Contribution to journalArticle


This paper proposes an FFT (Fast Fourier Transform) interference detection for interference suppression which combines notch filtering and FEC (forward error correction) to improve the Pe (probability of error) performance degradation due to co-channel interference in digital satellite communication systems. The proposed FFT interference detection scheme can determine the co-channel interference carrier frequency, power, and bandwidth precisely by using the power detection threshold suitable for the desired signal power spectrum, and the notch filter characteristic can be set according to the results. The interference suppression with the proposed scheme achieves the degradation in required Eb/No to only 1.0 dB at a Pe of 10~4 compared to that with the optimum notch filter (ideal detection) in unknown CW (continuous wave) and FM (frequency modulation) co-channel interference environments. Moreover, the proposed scheme improves the required Eb/No by 6.5 dB compared to that without a notch filter in an FM interference environment with interference carrier frequency offset normalized by the desired signal clock rate of 0.52, desired to undesired (interference) signal power ratio of 3 dB and interference bandwidth at 10 dB down power point from the peak normalized by the desired signal clock rate of 0.25.

Original languageEnglish
Pages (from-to)1352-1362
Number of pages11
JournalIEICE Transactions on Communications
Issue number9
Publication statusPublished - 1997 Jan 1



  • Co-channel interference
  • Digital satellite communication
  • FEC
  • FFT
  • Interference suppression
  • Notch filter

ASJC Scopus subject areas

  • Software
  • Computer Networks and Communications
  • Electrical and Electronic Engineering

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