• 学术论文 •

### 基于APD与PIN接收机的UWOC系统误码率性能优化研究

1. 河海大学计算机与信息学院, 江苏 南京 211100
• 收稿日期:2020-10-30 修回日期:2021-03-04 出版日期:2022-02-25
• 通讯作者:
• 李岳衡
• 作者简介:
• 史宏强 男，1996年10月出生，江苏泰州人.河海大学计算机与信息学院硕士研究生.主要研究方向为水下无线光通信．E-mail: shq829@vip.qq.com
李岳衡（通讯作者） 男，1971年出生，湖南永兴人.于东南大学获工学博士学位.现为河海大学教授，研究生导师.主要研究方向为水下无线光通信、人工智能与数学优化、大规模MIMO传输技术等．
• 基金资助:
• 中央高校基本科研业务费项目 (2019B15714); 国家自然科学基金 (61832005)

### Study on the BER Optimization of UWOC Systems Based on APD and PIN Receivers

SHI Hong-qiang, LI Yue-heng, HUANG Ping, TAN Yue-yue, LIU Shan-shan, JU Mei-yan

1. School of Computer and Information, Hohai University, Nanjing, Jiangsu 211100, China
• Received:2020-10-30 Revised:2021-03-04 Online:2022-02-25 Published:2022-02-25
• Corresponding author:
• LI Yue-heng
• Supported by:
• Program of Fundamental Research Funds for the Central Universities (2019B15714); National Natural Science Foundation of China (61832005)

Abstract:

The bit error rate(BER) and its associated optimization of an underwater wireless optical communication(UWOC) system employing avalanche photodiode(APD) and positive-intrinsic-negative(PIN) photodiode as receivers were investigated. For this purpose, a double-exponential path loss channel that takes the pointing error into account was proposed, which was verified by numerical simulations to be more suitable for modeling the characteristics of UWOC under clear ocean water links. Based on this model, the theoretical expressions of system BER were deduced when we adopted on-off keying(OOK) modulation in two different receiver scenarios mentioned above. To minimize the BER further, we proved that the problem is actually a simple convex optimization problem about the tilting angle of the receiver, and then provided possible theoretical solution and its corresponding numerical verifications. Both theoretical analysis and simulation results show that according to the optimal tilting angle obtained by theoretical calculation and simulations, the receiver can be reasonably tilted; and the BER performance can be improved up to 71.68% compared with the one before tilting.