基于翻转正交频分复用的光通信LED失真抑制

LED Distortion Suppression of Optical Communication Based on Reverse Orthogonal Frequency Division Multiplexing

在对可见光通信LED非线性失真抑制方法的研究中,为提高通信质量,针对采用当前的算法进行LED失真抑制时,当可见光通信的载波出现负信号失真时,不能有效的实现失真动态补偿问题,提出基于翻转正交频分复用算法的可见光通信LED非线性失真抑制方法。采用QAM调制光接收机接收到的通信信号,利用IFFT变换的线性特性将通过QAM调制的通信数据向量进行信号组合,基于翻转正交频分复用算法获取与翻转正交频分复用正信号和翻转负信号相对应的接收信号,采用动态补偿进行可见光通信LED非线性失真抑制,获取经过负信号消波的信号,在此基础上利用有效信噪比最优的原则给出了光功率约束下抑制限幅失真的最优偏置信号和Flip-OFDM信号功率。仿真结果表明,提出的可见光通信LED非线性失真抑制方法具有较高的补偿效率。

A LED nonlinear distortion suppression method in visible light communication was proposed based on a flip orthogonal frequency division multiplexing algorithm. The communication signals were received using QAM modu- lation optical receiver. By using the linear characteristics of IFFT transform, the signal combination was carried out with communication data vector through QAM modulation. Based on the flip orthogonal frequency division multiple- xing algorithm, the positive signal of flip orthogonal frequency division multiplexing and the received signal corre- sponding to turning negative signal were obtained. By dynamic compensation, LED nonlinear distortion of visible light communication was suppressed, to obtain the signal through negative signal wave absorbing. On this basis, using the principle of that the effective SNR is the optimal, the optimal bias signal and Flip - OFDM signal power of amplitude limit distortion were given in the optical power constraints. The simulation results show that the proposed suppression method has high compensation efficiency.