An integrated interference suppression scheme with an adaptive equalizer for digital satellite communication systems

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/f(N) of 2.3 (BWi: interference signal required bandwidth, f(N): one half the Nyquist bandwidth of the desired signal), a Delta f/f(N) of 1.05 (Delta f: interference frequency offset) and a D/U of 3 dB (desired to undesired (interference) signal power ratio), the proposed scheme improves the required E(b)/N-0 by 1.5 dB at a Pe of 10(-4) compared to that without an adaptive equalizer.