6
FSO Link Performance under the Effect of Atmospheric Turbulence
This chapter analyses the effect of atmospheric turbulence on the different modulation techniques used in FSO. Atmospheric turbulence is known to cause signal fading in the channel, and the existing mathematical models for describing the fading have already been introduced in Chapter 3. There are many different types of modulation schemes that are suitable for optical wireless communication systems as discussed in Chapter 4; the emphasis in this chapter will, however, be on the effect of atmospheric turbulence-induced fading on the following techniques: on–off keying (OOK), pulse position modulation (PPM) and phase shift keying premodulated subcarrier intensity modulation. Since ...
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