Performance analysis of shortwave differential frequency hopping systems with partial-band jamming
Lin Jing · Chinese Journal of Radio Science · 2006
This paper presents an error probability analysis for the shortwave differential frequency hopping (DFH) system over a nonfading channel and a frequency-nonselective slowly fading channel with partial-band jamming. The noncoherent square-law energy detector and the viterbi decoder are used in the DFH receiver. If fading exists in the channel, each transmitted hop is assumed to fade independently according to a Rayleigh process. The partial-band jamming is modeled as additive Gaussian noise. Background thermal noise is considered in the analysis. Numerical results show that the inherent dependence of adjacent transmitted frequencies provides good partial-band jamming rejection capability for the DFH system. If background thermal noise is neglected and the signal-to-jamming ratio (SJR) is 20dB, the worst-case bit error rate can reach 10-5 over a nonfading channel, while it can reach 10-3 over a frequency-nonselective slowly Rayleigh fading channel.