| Authors: | |
| Ruowen Bai | |
| Steve Hranilovic |
One Sentence Summary:
antisymmetry-constructed clipped optical OFDM (AC-OFDM) is proposed
Abstract:
-In this paper, antisymmetry-constructed clipped optical OFDM (AC-OFDM) is proposed for intensity modulation with direct detection (IM/DD) systems, in which an antisymmetry property is imposed directly in time domain. AC-OFDM has the same spectral efficiency as traditional asymmetrically clipped optical OFDM (ACO-OFDM) but is less complex to implement. Layered AC-OFDM (LAC-OFDM) is then proposed as an extension to further improve spectral efficiency, where different layers of AC-OFDM signals are added in the time domain and transmitted simultaneously. Computational complexity analysis and numerical results show that LAC-OFDM has the same spectral efficiency as layered asymmetrically clipped optical OFDM (LACO-OFDM) and enhanced unipolar OFDM (eUOFDM) but is less complex in terms of both the number of real multiplications and real additions required. Specifically, LACOFDM requires less than half the multiplication and addition operations compared to the comparable LACO-OFDM scheme. Monte Carlo simulation results show that LAC-OFDM has the same bit error rate (BER) performance as LACO- and eUOFDM. Index Terms-visible light communications, intensity modulation with direct detection (IM/DD), OFDM, LACO-OFDM, eUOFDM.