Title :
Performance Analysis of DHT-Based Optical OFDM Using Large-Size Constellations in AWGN
Author :
Moreolo, Michela Svaluto
Author_Institution :
Centre Tecnol. de Telecomunicacions de Catalunya, Castelldefels, Spain
fDate :
5/1/2011 12:00:00 AM
Abstract :
We demonstrate that optical OFDM (O-OFDM) based on discrete Hartley transform (DHT) can be used with large-size constellations, furnishing alternative simplified schemes suitable for intensity-modulated direct-detection (IM/DD) systems. Both DC-biased and power-efficient asymmetrically clipped (AC) solutions are analyzed for real constellations from BPSK (binary-phase-shift keying) to 32 PAM (pulse-amplitude modulation). The performance is compared to standard O-OFDM based on fast Fourier transform (FFT) using constellations from 4 QAM (quadrature-amplitude modulation) to 1024 QAM, showing perfect agreement. The analysis of clipping effect evidences the suitability of the proposed AC scheme for adaptive systems.
Keywords :
AWGN channels; OFDM modulation; discrete Hartley transforms; intensity modulation; optical fibre networks; phase shift keying; pulse amplitude modulation; quadrature amplitude modulation; 1024 QAM; 32 PAM; 4 QAM; AC scheme; AWGN; BPSK; DC-biased solution; DHT-based optical OFDM; FFT; IM-DD systems; O-OFDM; adaptive systems; binary phase shift keying; clipping effect; discrete Hartley transform; fast Fourier transform; intensity-modulated direct-detection systems; large-size constellations; power-efficient asymmetrically-clipped solutions; pulse amplitude modulation; quadrature amplitude modulation; Bit error rate; High speed optical techniques; Noise; OFDM; Quadrature amplitude modulation; Transforms; Optical OFDM; asymmetrically clipped optical OFDM; discrete Hartley transform; intensity modulated direct detection;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2011.040111.102333
