可见光通信中LED失真负信号消波抑制算法

LED Distortion Negative Signal Removing Suppression Algorithm in Visible Light Communication

在可见光通信中采用正交频分复用进行低通信道调制而产生强烈的LED非线性失真。传统的抑制该类失真的方法采用单极性单周补偿控制算法进行LED失真抑制,当载波幅值出现负信号失真时,无法实现失真动态补偿。提出一种基于翻转正交频分复用(Flip-OFDM)的负信号消波LED失真抑制算法,通过翻转正交频分复用实现负信号消波抑制,保证LED工作在准线性安全区域。实验表明,该算法能得到平稳的CCDF均衡,失真误差得到及时动态补偿,误比特率较低,在光通信系统设计中有较好应用价值。

In the visible light communication, orthogonal frequency division multiplexing is used for low pass channel’s modulation, strong LED distortion is produced. Traditional method uses the single week compensation control algorithm, when the load amplitude has negative signal distortion, and it is unable to realize the distortion dynamic compensation. An orthogonal frequency division multiplexing （Flip-OFDM） LED distortion suppression algorithm is proposed based on nega-tive signal removing. Negative signal wave distortion suppression is realized. It ensures LED works in quasi linear safety ar-ea. Simulation results show that the algorithm can get steady CCDF equilibrium, the distortion error can be compensated and suppressed timely, and the bit error rate is low. It has good application value in the design of optical communication system.