Polarity separating optical orthogonal frequency division multiplexing for free-space visible light communications
Polarity separating optical orthogonal frequency division multiplexing for free-space visible light communications
复制标题
DOI：
10.1117/1.oe.56.2.026118
复制
发表时间：
2017-02
影响因子：
1.3
通讯作者：
Jianfeng Li;Zhitong Huang;Jianke Li;Xiaoshuang Liu
中科院分区：
文献类型：
--
作者：
Jianfeng Li;Zhitong Huang;Jianke Li;Xiaoshuang Liu
摘要。针对可见光通信系统中发光二极管（LED）的非线性特性，提出了一种极性分离光正交频分复用（PSO-OFDM）调制格式。利用极性分离器将时域x(t)的OFDM信号分成x+(t)和x−(t)两部分，从不同的led平行传输，在自由空间线性重叠，实现PSO-OFDM。实验结果表明，与其他方法相比，PSO-OFDM具有较高的频谱效率和较小的非线性失真。采用PSO-OFDM可以显著提高调制指数和误码率性能。
Abstract. A modulation format, polarity separating optical orthogonal frequency division multiplexing (PSO-OFDM), is proposed to mitigate the light-emitting diode (LED) nonlinearity for visible light communication systems. A polarity separator is used to divide the OFDM signal in time domain x(t) into two parts: x+(t) and x−(t), which will be transmitted parallelly from the different LEDs and overlap linearly in free space to realize PSO-OFDM. The experimental results demonstrate that PSO-OFDM has high spectral efficiency and suffers less nonlinear distortions than other methods. Employing PSO-OFDM, the modulation index and bit error rate performance can be significantly enhanced.