Premium
Performance analysis of spatial OFDM for pixelated optical wireless systems
Author(s) -
Mondal M. Rubaiyat H.,
Panta Kusha
Publication year - 2017
Publication title -
transactions on emerging telecommunications technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.366
H-Index - 47
ISSN - 2161-3915
DOI - 10.1002/ett.2948
Subject(s) - orthogonal frequency division multiplexing , vignetting , computer science , optical wireless , spatial frequency , electronic engineering , joint (building) , bit error rate , wireless , channel (broadcasting) , telecommunications , optics , physics , engineering , architectural engineering , lens (geology)
Pixelated optical wireless systems can transmit at high speed by encoding data in transmitted images using spatial orthogonal frequency division multiplexing (spatial OFDM) but are susceptible to a number of limiting factors including defocus, linear fractional misalignment (LFM) and vignetting. This paper investigates the effects of these impairments on the performance of both forms of spatial OFDM: spatial DC‐biased optical OFDM (SDCO‐OFDM) and spatial asymmetrically clipped optical OFDM (SACO‐OFDM). The novelty of this paper is in the theoretical analysis of the effect of defocus on a spatial OFDM based pixelated system. The theoretical results for defocus are found to be in agreement with the simulation results reported in the literature. Furthermore, the joint effects of defocus, LFM and vignetting are mathematically described. Analytical and simulation results show that these three factors are largely independent of each other. Simulation results indicate that these impairments and their associated mitigation techniques influence the optimum choice of DC bias for SDCO‐OFDM. Finally, it is shown that for the case of the joint impairments and for a given data rate, the bit error rate performance of SDCO‐OFDM with the optimum bias is slightly better than that of SACO‐OFDM. Copyright © 2015 John Wiley & Sons, Ltd.