• The Journal of Korean Institute of Communications and Information Sciences
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• v.17 no.8
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• pp.837-845
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• 1992

This paper shows the performance of FH /BFSK communication systems under worst case Jamming interference. The channel Is modeled with ratio-threshold technique, and as a lamming signal the tone Jamming and Gaussian Jamming are used. The performance is analyzed by using the channel capacity which is the code rate and bit signal-to-Jammer ratio, and we show that the performance degration becomes large as background noise Is big and obtain the best performance when the threshold level f is about 1.5.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.7 no.8
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• pp.1629-1637
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• 2003

In this paper, we analyzed the performance of a hybird DS/SFH(Direct­Sequency­Slow Frequency­Hopping) Spread Spectrum system with BFSK modulation over Nakagami­m fading channel with multitone jamming. The performance of the system was improved when a frequency bowing rate increased. In case that process gain of hybrid DS/SFH Spread Spectrum system to be fixed, the hybrid DS/SFH Spread Spectrum takes the low bit error probability than a DS Spread Spectrum system. Also, when the fading index m increases, the fading effect decrease, when the JSR(jamming to signal power ratio) increases ,the performance of a hybrid DS/SFH Spread Spectrum system improved than DS Spread Spectrum system. The result, we have been proved that performance of a hybrid DS/SFH Spread Spectrum was superior to DS Spend Spectrum system over Nakagami­m fading with tome jamming.