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On the Clipping Noise in an ACO-OFDM Optical Wireless Communication System

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Original languageUndefined/Unknown
Title of host publicationProc. of IEEE Global Communications Conference (IEEE GLOBECOM 2010)
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Number of pages5
ISBN (Print)978-1-4244-5638-3
Publication statusPublished - 1 Jun 2010

Abstract

In this paper, the clipping noise in an asymmetrically clipped optical orthogonal frequency division multiplexing (ACO-OFDM) wireless communication system is derived semi-analytically. Clipping noise in ACO-OFDM is introduced either because of insufficient forward biasing of the emitter, or a low power sensitivity of the detector. Following the Bussgang theorem, the non-linear distortion caused by the clipping of the time domain signal attenuates the frequency domain subcarriers at the receiver and adds zero-mean Gaussian noise. The attenuation factor and the clipping noise variance are determined and verified through simulation. Finally, bit-error ratio (BER) and goodput simulations compare the performance of ACO-OFDM with a direct-current-biased optical OFDM (DCO-OFDM) system for different clipping levels and multilevel quadrature amplitude modulation (M-QAM) schemes.

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