Abstract
In this paper, the electrical power requirement and spectral efficiency of multi-carrier transmission schemes for optical wireless communications (OWC) are compared in the presence of front-end-induced double-sided signal clipping. The two existing multi-carrier modulation techniques based on orthogonal frequency division multiplexing (OFDM), direct-current-biased optical OFDM (DCO-OFDM) and asymmetrically clipped optical OFDM (ACO-OFDM), are studied. The clipping noise can be modeled according to the Bussgang theorem and the central limit theorem (CLT) as attenuation of the data-carrying subcarriers and addition of zero-mean complex-valued Gaussian noise. Presented closed-form expressions for the attenuation factor and the clipping noise variance are employed in the derivation of the effective electrical signal-to-noise ratio (SNR).
Original language | English |
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Title of host publication | IEEE GLOBECOM Workshops (GC Wkshps), 2011 |
Publisher | IEEE |
Pages | 787-791 |
Number of pages | 5 |
ISBN (Print) | 9781467300391 |
DOIs | |
Publication status | Published - 2011 |
Keywords
- optical wireless communications
- power systems
- OFDM
- modulation