Nonlinear Compensation based on Bidirectional Gate Recurrent Unit in Underwater Visible Light Communication System

被引：5
作者：
Cai, Jifan [1 ]
Lin, Xianhao [1 ]
Qin, Guojin [1 ]
Jin, Ruizhe [1 ]
Chi, Nan [1 ]
机构：
[1] Fudan Univ, Dept Commun Sci & Engn, Key Lab Informat Sci Electromagnet Waves MoE, Shanghai, Peoples R China
来源：
2022 31ST WIRELESS AND OPTICAL COMMUNICATIONS CONFERENCE (WOCC) | 2022年
关键词：
BGRU; VLC; nonlinear distortion;
D O I：
10.1109/WOCC55104.2022.9880586
中图分类号：
TP301 [理论、方法];
学科分类号：
081202 ;
摘要：
Visible light communication (VLC) has emerged as a promising communication method in the domain of underwater communication. However, the transmission rate is limited by the modulation bandwidth and the nonlinear effect of the LED. In this paper, we proposed a post-equalization method base on Bidirectional Gate Recurrent Unit (BGRU) and high order modulation format Amplitude phase shift keying (64APSK) is applied in underwater visible light communication (UVLC) for the first time. The excellent performance of nonlinearity compensation has been verified through experimental demonstration. With 64APSK and BGRU postequalization, the transmission rate of underwater 1.2m distance is up to 3.19 Gbps. Compared to the traditional Least Mean Square (LMS) algorithm, the transmission rate increases 140 Mbps with VPP of 0.7V, current bias of 150mA and Q factor increases 2.4dB at the maximum with VPP of 0.9V, current bias of 150mA and bit rate of 3 Gbps. Compared to the Normal64QAM, the transmission rate increases 65 Mbps and 64APSK shows a larger working range. All the results are demonstrated with 7% FEC of 3.8E-3 as a BER threshold. To the best of our knowledge, it is the first time 64APSK and BGRU postequalization are used in UVLC system and the bit rate exceeds 3 Gbps. BGRU is shown effective to deal with the nonlinear distortion and APSK modulation format is suitable for underwater high-power transmission, which are proved as a promising method in future UVLC.
引用
收藏
页码：30 / 34
页数：5
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