Experimental investigation of multi-band OCT precoding for OFDM-based visible light communications
Experimental investigation of multi-band OCT precoding for OFDM-based visible light communications
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DOI：
10.1364/oe.25.012908
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发表时间：
2017-05-29
期刊：
影响因子：
3.8
通讯作者：
Chen, Lian-Kuan
中科院分区：
文献类型：
--
作者：
Hong, Yang;Xu, Jing;Chen, Lian-Kuan
在本文中，我们提出并实验证明了一种信道无关的多带正交循环矩阵变换（MB-OCT）预编码，有效地打击严重的频率选择性衰落的可见光通信（VLC）。所提出的MB-OCT预编码具有吸引人的梯形信噪比（SNR）轮廓，因此可以通过对不同子带应用不同的正交幅度调制（QAM）水平来显著降低系统BER。研究了子带数目、信号带宽和循环前缀长度对VLC系统误码率的影响。我们实验比较的BER性能的建议MB-OCT预编码与传统的MB离散傅里叶变换（MB-DFT）预编码和自适应加载离散多音（DMT）。结果表明，MB-OCT预编码优于MB-DFT预编码和单频带的情况下，不同的数据速率。此外，它具有较低的实现复杂度和可比的自适应加载DMT的BER性能。对于传输距离为2 m的700 Mb/s VLC系统，采用MB-OCT预编码后，误码率从1.53 × 10（-2）降低到1.17 × 10（-4）。(C)2017美国光学学会
In this paper, we propose and experimentally demonstrate a channel-independent multi-band orthogonal circulant matrix transform (MB-OCT) precoding, to efficiently combat the severe frequency-selective fading of visible light communications (VLC). The proposed MB-OCT precoding exhibits an attractive ladder-like signal-to-noise-ratio (SNR) profile, thus can significantly reduce system BER by applying different quadrature amplitude modulation (QAM) level to different sub-bands. The impacts of sub-band number, signal bandwidth, and length of cyclic prefix (CP) on bit error rate (BER) of the VLC system are investigated. We experimentally compare BER performance of the proposed MB-OCT precoding with that of the conventional MB discrete Fourier transform (MB-DFT) precoding and the adaptiveloaded discrete multitone (DMT). The results show that the MB-OCT precoding outperforms the MB-DFT precoding and the single-band case for different data rates. Furthermore, it exhibits reduced implementation complexity and comparable BER performance with the adaptive-loaded DMT. For similar to 700-Mb/s VLC system with 2-m transmission distance, the BER is reduced from 1.53 x 10(-2) to 1.17 x 10(-4) by using the proposed MB-OCT precoding. (C) 2017 Optical Society of America