Abstract
Error rate performance is analyzed for subcarrier noncoherent and differentially
coherent modulated optical wireless communication systems over atmospheric
turbulence channels. Both Gamma-Gamma and negative exponential channels are
considered. Using a moment generating function approach, we obtain a unified
bit-error rate expression for a family of noncoherent and differentially coherent
modulations. We also analyze the symbol-error rate performance of subcarrier M-ary differential
phase-shift keying and M-ary noncoherent frequency-shift keying modulated systems using
the same frequency domain approach. Our asymptotic analysis reveals relative
error rate performance of M-ary differential phase-shift keying and M-ary noncoherent frequency-shift keying
in different channel conditions.
© 2013 IEEE
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