LED非线性信道下基于对称恢复的ACO-OFDM性能研究

LASER & OPTOELECTRONICS PROGRESS(2019)

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Abstract
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.
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Key words
optical communications, modulation, visible light communications, asymmetrically limiting light, orthogonal frequency division multiplexing, diversity combining
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