A Simple OFDM Scheme for VLC Systems Based on $\mu $ -Law Mapping
A Simple OFDM Scheme for VLC Systems Based on $\mu $ -Law Mapping
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DOI：
10.1109/lpt.2015.2503481
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发表时间：
2016-03
影响因子：
2.6
通讯作者：
Yang Yang-Yang;Zhimin Zeng;Shulan Feng;Caili Guo
中科院分区：
文献类型：
--
作者：
Yang Yang-Yang;Zhimin Zeng;Shulan Feng;Caili Guo
提出了一种用于可见光通信的简单正交频分复用（OFDM）方案μ-OFDM。在该方案中，峰均功率比（PAPR）降低技术，μ律压扩，首次引入到VLC系统中，以实现VLC传输所需的信号格式。由于压扩操作的固有特性，在该方案中获得低PAPR信号。与大多数单极性光OFDM方案（如非对称限幅光OFDM方案）相比，μ-OFDM的频谱效率提高了一倍。此外，该方案显示出显着的能量优势，直流偏置光OFDM方案和极化OFDM方案。据我们所知，这是单极光OFDM方案的第一个设计，该方案能够在发光二极管的动态范围的约束下实现高频谱和能量效率。
A simple orthogonal frequency division multiplexing (OFDM) scheme termed μ-OFDM is proposed for visible light communication (VLC). In this scheme, the peak-to-average power ratio (PAPR) reduction technique, μ-law companding, is first introduced in VLC systems to achieve the required signal format for VLC transmission. Due to the inherent characteristics of the companding operation, low PAPR signals are obtained in the scheme. Compared with most of the unipolar optical OFDM schemes, such as asymmetrically clipped optical OFDM scheme, μ-OFDM doubles the spectral efficiency. Furthermore, this scheme shows significant energy advantages over direct-current biased optical OFDM scheme and polar OFDM scheme. To the best of our knowledge, this is the first design of a unipolar optical OFDM scheme, which is able to achieve both high spectrum and energy efficiency under a constraint of the dynamic range of the light-emitting diodes.