An Integrated Interference Suppression Scheme with An Adaptive Equalizer for Digital Satellite Communication Systems

Takatoshi SUGIYAMA
Masanobu SUZUKI

IEICE TRANSACTIONS on Communications   Vol.E79-B    No.2    pp.191-197
Publication Date: 1996/02/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Satellite Communication
satellite communication,  co-channel interference,  interference suppression,  notch filter,  FEC,  adaptive equalizer,  

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This paper proposes an integrated interference suppression scheme which realizes interference-resistant satellite digital signal transmission systems. It employs a notch filter in the receiving side to suppress the co-channel interference (CCI) signal. Moreover, the proposed scheme employs an adaptive equalizer combined with a forward error correction (FEC) scheme to improve the Pe (probability of error) performance degradation due to the inter-symbol interference caused by notch filtering of the desired signal. In the typical frequency modulation (FM) CCI environment with a BWi/FN of 2.3 (BWi: interference signal required bandwidth, fN: one half the Nyquist bandwidth of the desired signal), a Δf / fN of 1.05 (Δf: interference frequency offset) and a D/U of 3 dB (desired to undesired (interference) signal power ratio), the proposed scheme improves the required Eb/NO by 1.5 dB at a Pe of 10-4 compared to that without an adaptive equalizer.