A phase-coherent Direct Sequence and Frequency Hopping (DS/FH) spread-spectrum signal has a much wider bandwidth than simple DS spread spectrum signals.Due to the non-linearity of ionosphere and frequency hopping scheme of the signal,Binary Phase Shift Keying (BPSK) Bit Error Rate (BER) deteriorates.Under the assumption of pure background ionospheric dispersion and a uniformly-distributed FH pattern,the BER of both the pilot signal and the long term signal in a specific DS/FH satellite link are acquired through using mathematical tools concerning the probability density functions of Random Variables (RVs).Simulations under constant ionospheric dispersion and uniformly-distributed FH pattern scintillation conditions are carried out to verify BER results.
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