There are many modulation methods suitable for optical wireless communication. OOK, PPM are adopted widely in optical wireless communication for its high average-power-efficiency. DPPM, DPIM and DH-PIM are three new modulation methods for optical wireless communication, which may be the substitutes of PPM because of their better performance in power efficiency and bandwidth efficiency. In this paper, in combination of the characteristic of the atmospheric optical wireless channel, the bandwidth efficiency, transmission capacity, power efficiency and slot error rate of the typical modulation schemes as OOK, PPM, DPPM, DPIM and DH-PIM for atmospheric optical wireless communications are analyzed. Theoretical analysis and simulation results show that DPPM, DPIM and DH-PIM are more applicable for the future optical wireless communication.
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Gao et al. (2011) studied this question.
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