Abstract
The dc-biased optical orthogonal frequency division multiplexing (DCO-OFDM) system is experimentally demonstrated as an appealing candidate in future visible light communication (VLC) system. However, the intrinsic high PAPR drawback that the DCO-OFDM system suffers from still needs to be addressed and few effective approach has been found so far. To deal with this problem, in this paper, the tone reservation (TR) technique based the time domain kernel matrix (TKM-TR) schemes for reducing the PAPR are studied and applied to DCO-OFDM system. Aiming at the drawback of its severe tailing in previous TKM-TR schemes, first an improved TKM-TR scheme is proposed, in which the peak regrowth caused by severe tailing is eliminated by optimizing the scaling factors. In addition, considering the clipping ratio (CR) value in TKM-TR scheme is greatly related to the PAPR reduction performance, an extensively used heuristic global optimization algorithm, the particle swarm optimization (PSO) method is employed in TKM-TR to obtain a better CR for more PAPR reduction. Simulation results show that the improved TKM-TR scheme can efficiently address the tailing problem in previous TKM-TR schemes and achieve better PAPR reduction. Moreover, due to the powerful searching ability, PSO based TKM-TR scheme achieves more PAPR reduction and lower bit error rate (BER).
Highlights
Owing to the advantages of huge bandwidth, unlicensed frequency, immune to electromagnetic interference and high security [1,2,3], visible light communication (VLC) technology is considered as a potential candidate to complement the conventional radio frequency (RF) communication
In the proposed improved-TKM-tone reservation (TR) method, we propose the idea that the small clipping ratio signals are just kept as their original state without clipping
The particle swarm optimization (PSO) based time domain kernel matrix (TKM-TR) scheme obtains much better PAPR reduction performance when compared with the other TR methods and effectively addresses the problem of severe tailing caused by the peak regrowth
Summary
Owing to the advantages of huge bandwidth, unlicensed frequency, immune to electromagnetic interference and high security [1,2,3], visible light communication (VLC) technology is considered as a potential candidate to complement the conventional radio frequency (RF) communication. One issue that the practical VLC system suffers from is the single carrier pulsed modulation technique, such as on-off Keying (OOK), variable pulse position modulation (VPPM) or pulse amplitude modulation (PAM) [4], which can cause severe inter symbol interference (ISI) To deal with this problem, orthogonal frequency division multiplexing (OFDM) based VLC system has been proposed, such as direct current (DC)-biased optical OFDM (DCO-OFDM) [5], Flip-OFDM [6], asymmetrically clipped optical OFDM (ACO-OFDM) [7] and so on. The simulation results reveal that the improved TKM-TR scheme can effectively reduce the probability of peak regrowth and the PSO based TKM-TR method can further suppress the peak regrowth, with much better PAPR reduction performance and lower BER than other existing TR algorithms
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