An Efficient Flicker-Free FEC Coding Scheme for Dimmable Visible Light Communication Based on Polar Codes
An Efficient Flicker-Free FEC Coding Scheme for Dimmable Visible Light Communication Based on Polar Codes
复制标题
基于Polar码的可调光可见光通信高效无闪烁FEC编码方案
DOI：
10.1109/jphot.2017.2689744
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发表时间：
2017-06-01
影响因子：
2.4
通讯作者：
Chen, Zhe
中科院分区：
文献类型：
--
作者：
Fang, Junbin;Che, Zhen;Chen, Zhe
可见光通信（VLC）可以提供短距离的光学无线通信，以及使用发光二极管（LED）照明的照明。由于传统的前向纠错（FEC）码不能同时提供调光支持和闪烁抑制两种与照明相关的特性，现有的可靠VLC编码方案通常依赖于辅助编码技术，结构复杂，传输效率低。为了提高传输效率，简化编码结构，提出了一种基于极性编码的高效无闪烁的可调光VLC FEC编码方案。该方案利用极码的递归编码结构，在不增加编码分量的情况下，可以保证任意码率下的等概率和1秒和0秒的短时运行。数值结果表明，该方案的传输效率是现有方案的两倍。此外，在调光比<inline-formula>< text -math notation="LaTeX">$25\%$</ text -math></inline-formula> </inline-formula>或<inline-formula>< text -math notation="LaTeX">$75\%$</ text -math></inline-formula>时，该方案的编码增益分别比基于RS码的方案和基于低密度奇偶校验码的方案高约4.6 dB和1.4 dB。
Visible light communication (VLC) can provide short-range optical wireless communication, together with illumination using light-emitting diode (LED) lightings. Since conventional forward error correction (FEC) codes cannot provide two lighting related features, dimming support, and flicker mitigation, the existing coding schemes for reliable VLC usually rely on auxiliary coding techniques, which cause a complicated structure and a low transmission efficiency. In this paper, based on polar codes, an efficient and flicker-free FEC coding scheme for dimmable VLC is proposed to increase the transmission efficiency and simplify the coding structure. Taking advantage of polar codes’ recursive encoding structure, the proposed scheme can guarantee the equal probability and the short runs of 1 s and 0 s for arbitrary code rate without extra coding components. Numerical results show that the proposed scheme can have twice higher transmission efficiency than the existing schemes. Furthermore, at a dimming ratio of <inline-formula><tex-math notation="LaTeX">$25\%$</tex-math></inline-formula> or <inline-formula> <tex-math notation="LaTeX">$75\%$</tex-math></inline-formula>, the coding gain of the proposed scheme is about 4.6 dB and 1.4 dB higher than that of the Reed–Solomon (RS) codes based scheme and the low-density parity check code based scheme, respectively.