Lasers, Fiber Optics, and Communications

Peak-to-average power ratio reduction in orthogonal frequency division multiplexing visible light communications system using a combination of a genetic algorithm and a hill-climbing algorithm

[+] Author Affiliations
Wei Xiao, Fangqing Jiang, Kaicheng Zhu, Linzi Yin

Institute of Super-microstructure and Ultrafast Processes in Advanced Materials, Hunan Province, Central South University, Changsha 410083, China

Honggui Deng

Institute of Super-microstructure and Ultrafast Processes in Advanced Materials, Hunan Province, Central South University, Changsha 410083, China

Joint Research Institute, Xinjiang Nonferrous Central South University, China

Opt. Eng. 54(3), 036106 (Mar 16, 2015). doi:10.1117/1.OE.54.3.036106
History: Received December 16, 2014; Accepted February 4, 2015
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Abstract.  The orthogonal frequency division multiplexing (OFDM) modulation technique has been used widely in visible light communications (VLC) systems to combat intersymbol interference. At the same time, the inherent drawback of OFDM with a high peak-to-average power ratio (PAPR) is brought into OFDM visible light communications (VLC-OFDM). Furthermore, considering the limited dynamic range characteristics of light-emitting diodes, the performance degradation caused by a high PAPR is more serious in VLC-OFDM. In this paper, we propose a partial transmit sequence (PTS) technique based on the combination of a genetic algorithm (GA) and a hill-climbing algorithm (GH-PTS) to solve the problem of high PAPR. GH-PTS is a modified PTS technique based on GA-PTS. Essentially, GH-PTS is a local optimization of GA-PTS. Simulation results show that the optimized technique is able to reduce PAPR more effectively without any loss of bit error rate performance than the GA-PTS technique in VLC-OFDM system.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Wei Xiao ; Honggui Deng ; Fangqing Jiang ; Kaicheng Zhu and Linzi Yin
"Peak-to-average power ratio reduction in orthogonal frequency division multiplexing visible light communications system using a combination of a genetic algorithm and a hill-climbing algorithm", Opt. Eng. 54(3), 036106 (Mar 16, 2015). ; http://dx.doi.org/10.1117/1.OE.54.3.036106


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