激光与光电子学进展, 2019, 56 (21): 210603, 网络出版: 2019-11-02
LED非线性信道下基于对称恢复的ACO-OFDM性能研究 下载: 804次
Symmetry Recovery-Based ACO-OFDM Performance in LED Nonlinear Channel
光通信 调制 可见光通信 非对称限幅光 正交频分复用 分集合并 optical communications modulation visible light communications asymmetrically limiting light orthogonal frequency division multiplexing diversity combining
摘要
针对可见光通信系统中的LED非线性失真效应,提出基于对称恢复的非对称限幅光正交频分复用(ACO-OFDM)接收机。利用ACO-OFDM的对称恢复特性,可以在时域实现奇数和偶数子信道之间的频谱分集。理论与实验证明,该方案在高非线性的可见光通信系统上实施效果良好。仿真结果证明了所使用的分集合并方案优于传统的ACO-OFDM方法。此外发现,增加调制指数导致较为显著的非线性时,该方案能够呈现出更好的性能。
Abstract
A symmetry recovery-based receiver in an asymmetrically clipped optical orthogonal frequency division multiplexing (ACO-OFDM) system is proposed to achieve LED nonlinearity in visible light communication systems. Based on the symmetric recovery characteristics of ACO-OFDM, a spectral diversity that combines odd and even sub-channels can be achieved in the time domain. Theoretical and experimental results show that the proposed scheme has a good performance when it is applied to a highly nonlinear visible light communication system. Simulation results demonstrate that the proposed method outperforms conventional ACO-OFDM solutions. Furthermore, we find that the proposed method exhibits better performance when an increased modulation index leads to significant nonlinearity.
刘晓爽, 李建锋, 李建科, 孙立辉, 黄治同, 康红俊. LED非线性信道下基于对称恢复的ACO-OFDM性能研究[J]. 激光与光电子学进展, 2019, 56(21): 210603. Xiaoshuang Liu, Jianfeng Li, Jianke Li, Lihui Sun, Zhitong Huang, Hongjun Kang. Symmetry Recovery-Based ACO-OFDM Performance in LED Nonlinear Channel[J]. Laser & Optoelectronics Progress, 2019, 56(21): 210603.