Low-Complexity Digital Equalizers for High-Speed Underwater Optical Wireless Communication  

作　　者：LI Chao HU Zhijia 

机构地区：[1]Information Materials and Intelligent Sensing Laboratory of Anhui Province,Institutes of Physical Science and Information Technology,Anhui University,Hefei 230601,China [2]Information Materials and Intelligent Sensing Laboratory of Anhui Province,School of Physics and Materials Science,Anhui University,Hefei 230601,China

出　　处：《Chinese Journal of Electronics》2021年第6期1167-1172,共6页电子学报（英文版）

基　　金：supported by the Anhui Provincial Natural Science Foundation of China (No.1808085MF186)。

摘　　要：Hundreds of Megabit per second(Mb/s)data transmission over a moderate range(10 m) underwater optical wireless channel is implemented with 4-level pulse amplitude modulation scheme using an off-the-shelf light-emitting diode as the optical source and digital equalizers. In particular, the channel nonlinear distortion from light-emitting diode is considered and a matched model is developed. To mitigate these distortions under various 4-level pulse amplitude modulation signal baud rates, the Bit error rate(BER) and Signal-to-noise ratio(SNR) performances of the pre-, post-and matchedequalizers are evaluated and compared. The digital matched-equalizer bank is shown and verified to offer the best BER/SNR performance for 4-level pulse amplitude modulation signal using more than 200 MBaud rate. With the proposed equalizer, we have recorded the highest data rate of 600 Mb/s at 20% FEC limit over 10 m free-space underwater link.

关 键 词：Underwater optical wireless communication Light-emitting diode Inter-symbol interference Digital equalizer 

分 类 号：TN715[电子电信—电路与系统] TN929.3