In this paper, the impact of clipping noise on optical

wireless communication (OWC) systems employing orthogonal

frequency division multiplexing (OFDM) is investigated. The

two existing optical OFDM (O-OFDM) transmission schemes,

asymmetrically clipped optical OFDM (ACO-OFDM) and directcurrent-

biased optical OFDM (DCO-OFDM), are studied. Time

domain signal clipping generally results from direct current

(DC) biasing and/or from physical limitations of the transmitter

front-end.