IMPACT OF CLIPPING NOISE ON OPTICAL WIRELESS COMMUNICATION SYSTEMS BY USING OFDM

Abstract

Orthogonal Frequency Division Multiplexing (OFDM) is important multiplexing technique in optical
communications because of its robustness against channel dispersion and its high spectral efficiency. Orthogonal
Frequency Division Multiplexing (OFDM) is a way to overlap multiple channel spectra with limited bandwidth
without interference taking considerations of effect of both filter and channel characteristics. Clipping results from
imperfect biasing and non linarites at transmitter front end. With the optimal choice of modulation scheme, variation
in system parameters depending upon operating conditions spectrum efficiency, energy efficiency and proper BER
can be obtained. Here impact of clipping noise on optical wireless communication based on OFDM is discussed. The
paper presents impact of clipping noise in optical wireless communication systems OFDM. The simulation results are
presented to compare the bit error rate (BER) performance of Asymmetrically clipped optical OFDM (ACO -
OFDM)and direct current bias optical OFDM( DCO-OFDM).