The inherent robustness of OFDM against

multipath effects makes it an excellent choice for situations

where multiple transmitters are used simultaneously (to avoid

shadowing effects) and a path difference to the receiver exists.

One of the major disadvantages of an OFDM based system is

the characteristic high crest factor of the time domain signal.

In traditional RF based systems, this usually necessitates a

transmitter with a high dynamic range and hence results in

reduced power efficiency. In the proposed optical LED system,

this disadvantage is turned to an advantage - the time domain

OFDM signal is used to modulate (IM-DD) the optical source.