光通信研究Issue(2)：52-59,8.DOI:10.13756/j.gtxyj.2025.240013
基于改进型曼彻斯特编码的UWOC解调算法设计
Design of a Demodulation Algorithm for UWOC based on Improved Manchester Coding
张优 1胡芳仁 1赵晓燕 2周军 2王启龙2
作者信息
- 1. 南京邮电大学 电子与光学工程学院、柔性电子(未来技术)学院,南京 210023
- 2. 南京先进激光技术研究院,南京 210038
- 折叠
摘要
Abstract
[Objective]To meet the requirements of the engineering of high-speed Underwater Wireless Optical Communication(UWOC)technology,and to address the issue of high Bit Error Rate(BER)in underwater channels when using modulation methods such as On/Off Keying(OOK)that rely on threshold demodulation for high-speed communication,this paper conducts comparative simulation analysis of commonly used underwater optical communication modulation methods and proposes an im-proved modulation and demodulation algorithm that combines Pulse Position Modulation(PPM)with Manchester encoding and does not require threshold decision-making.[Methods]The paper uses sliding mean filtering to improve the Signal to Noise Ratio(SNR).The frame synchronization is then achieved by parallel multi-path threshold-free decision-making on the PPM frame header,providing a time calibration basis for Manchester encoding and demodulation.Finally,high-speed communication system with low BER is realized by using Manchester encoding sub-frame headers and Reed-Solomon(RS)error-correcting codes in the data part.The algorithm is designed and implemented on a Field Programmable Gate Array(FPGA),and a UWOC system us-ing this method is built to conduct BER tests under different environments and distances.[Results]The test results show that the UWOC system based on this demodulation algorithm has an BER of 10-5 in indoor clear water pools and 10-3 in nearshore lake wa-ter at a communication speed of 50 Mbit/s and a communication distance of 10 m.[Conclusion]The proposed algorithm in this paper is applied in nearshore lake water with a distance of 10 meters,compared to modulation methods such as OOK and PPM,using modified Manchester encoding modulation can achieve more reliable 50 Mbit/s communication.关键词
曼彻斯特编码/水下无线光通信/脉冲位置调制/并行无阈值解调Key words
Manchester code/UWOC/PPM/parallel demodulation without threshold分类
电子信息工程引用本文复制引用
张优,胡芳仁,赵晓燕,周军,王启龙..基于改进型曼彻斯特编码的UWOC解调算法设计[J].光通信研究,2025,(2):52-59,8.
