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降低可见光OFDM系统峰均比的新方法
A new method to reduce the PAPR of OFDM signal in visible light communication system
投稿时间:2014-01-14  修订日期:2014-03-22
中文关键词:可见光通信  正交频分复用  峰均功率比  选择性映射  离散傅里叶变换展开
英文关键词:Visible Light Communication  Orthogonal Frequency Division Multiplexing  Peak to Average Power Ratio  selective mapping  Discrete Fourier Transform Spread
基金项目:国家自然科学基金资助项目(61271253);国家863计划资助项目(2013AA013603)
作者单位
曾福来 Institute of Information System EngineeringInformation Engineering UniversityZhengzhou Henan 450002China 
刘洛琨 Institute of Information System EngineeringInformation Engineering UniversityZhengzhou Henan 450002China 
陈侯本 91230 UnitFuzhou Fujian 350000China 
杨金金 Institute of Information System EngineeringInformation Engineering UniversityZhengzhou Henan 450002China 
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中文摘要:
      可见光正交频分复用(OFDM)系统的一个主要缺点是系统的峰均比(PAPR)较高,会引起信号失真。为了降低可见光OFDM通信系统的峰均比,本文将选择性映射(SLM)方法引入可见光通信系统中,并将其进行适当的改进,使之满足可见光通信信号必须为正的实信号的要求。提出将离散傅里叶变换展开(DFTS)与SLM相结合(DFT-S-SLM)的方法来进一步降低可见光OFDM系统的峰均比。仿真结果表明,与原信号、仅采用DFT展开或者SLM方法相比,在增加一定的系统复杂度的情况下,DFT-S-SLM方法具有更好的峰均比性能。
英文摘要:
      High Peak to Average Power Ratio(PAPR) is one of the major disadvantages of the Visible Light Communication(VLC) Orthogonal Frequency Division Multiplexing(OFDM) system as it can cause signal distortion. A Selective Mapping(SLM) method is introduced in order to reduce the PAPR of OFDM signal in VLC system, which is modified to suit the demand that the signals must be positive and real. A method combining the Discrete-Fourier-Transform Spread(DFTS) and SLM is proposed to reduce the PAPR in VLC OFDM system further. The simulation results show that,comparing with the original signal,DFTS or SLM method used alone, the DFT-S-SLM method has the best PAPR performance at the cost of a certain increase of system complexity.
引用本文:曾福来,刘洛琨,陈侯本,杨金金.降低可见光OFDM系统峰均比的新方法[J].太赫兹科学与电子信息学报,2015,13(1):71~75
DOI:10.11805/TKYDA201501.0071
学科分类代码:
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