Abd Elkarim Mohammed, Elsherbini M M, AbdelKader Hala M, Aly Moustafa H
Appl Opt. 2020 Aug 20;59(24):7343-7351. doi: 10.1364/AO.397559.
Visible light communication (VLC) depends on light emitting diodes (LEDs) for data transmission. This is one of the strengths of VLC motivated by high optical efficiency and low cost. However, LEDs impose nonlinear effects on the transmitted signal and limit overall system performance, especially in the case of multicarrier modulation systems. This paper extends to the layered asymmetrically clipped optical, orthogonal frequency division multiplexing (LACO-OFDM) and investigates the impact of LED nonlinearity on system performance. The effect of the second-order nonlinear distortion in addition to the clipping noise is presented and analyzed at different power values assuming different strengths of nonlinearity. With a variable number of layers, the system performance is explored considering a nonlinear LED model. Finally, the impact of nonlinearity is investigated in the case of ACO-OFDM for the sake of comparison, bearing in mind that ACO-OFDM represents the first layer of LACO-OFDM.
可见光通信（VLC）依靠发光二极管（LED）进行数据传输。这是VLC的优势之一，其优势源于高光效率和低成本。然而，LED会对传输信号产生非线性效应，并限制整个系统的性能，尤其是在多载波调制系统的情况下。本文将研究扩展到分层非对称限幅光正交频分复用（LACO-OFDM），并研究LED非线性对系统性能的影响。在假设不同非线性强度的情况下，给出并分析了除削波噪声外二阶非线性失真在不同功率值下的影响。考虑到非线性LED模型，通过改变层数来探究系统性能。最后，为了进行比较，在非对称限幅光正交频分复用（ACO-OFDM）的情况下研究了非线性的影响，要记住ACO-OFDM代表LACO-OFDM的第一层。
