Novel Techniques for Combating DC Offset in Diversity Combined ACO-OFDM

Author

Dissanayake, Sarangi D. ; Armstrong, Jean

Author_Institution

Dept. of Electr. & Comput. Syst. Eng., Monash Univ., Melbourne, VIC, Australia

Volume

15

Issue

11

fYear

2011

fDate

11/1/2011 12:00:00 AM

Firstpage

1237

Lastpage

1239

Abstract

In this paper we present two novel techniques of diversity combined asymmetrically clipped optical orthogonal frequency division multiplexing (ACO-OFDM). The techniques are able to achieve better performance than conventional ACO OFDM while being unaffected by the variations in the zeroth subcarrier. Zeroth subcarrier variations are caused by DC offsets present in the biasing of the transmitter light emitting diode and receiver photo diode, and low frequency interference due to background noise sources such as fluorescent and incandescent lamps. Simulation results are presented which show that the new methods achieve better performance than ACO-OFDM.

Keywords

OFDM modulation; light emitting diodes; optical fibre networks; photodiodes; DC offset; asymmetrically-clipped optical orthogonal frequency division multiplexing; background noise; diversity-combined ACO-OFDM; fluorescent lamps; incandescent lamps; low-frequency interference; receiver photo diode; transmitter light emitting diode; zeroth subcarrier variations; Diversity reception; OFDM; Optical distortion; Optical modulation; Optical receivers; Optical transmitters; ACO-OFDM; DC offset; direct detection; diversity combining; intensity modulation; optical communications;

fLanguage

English

Journal_Title

Communications Letters, IEEE

Publisher

ieee

ISSN

1089-7798

Type

jour

DOI

10.1109/LCOMM.2011.092011.110709

Filename

6029938