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

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

doi:10.12236/DZXB.20201222

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

更新时间：2022-02-08

- Study on the BER Optimization of UWOC Systems Based on APD and PIN Receivers
- ACTA ELECTRONICA SINICA Pages: 1-9(2022)
- 作者机构：
  
  河海大学计算机与信息学院, 江苏南京211100
- 作者简介：
- 基金信息：
- DOI：10.12236/DZXB.20201222
  CLC： TN929.3;
- Received：30 October 2020，
  
  Revised：2021-03-04，
  
  Published Online：24 February 2022，
- 稿件说明：
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Hong-qiang SHI, Yue-heng LI, Ping HUANG, et al. Study on the BER Optimization of UWOC Systems Based on APD and PIN Receivers[J/OL]. ACTA ELECTRONICA SINICA, 2022, 1-9.
DOI：

Hong-qiang SHI, Yue-heng LI, Ping HUANG, et al. Study on the BER Optimization of UWOC Systems Based on APD and PIN Receivers[J/OL]. ACTA ELECTRONICA SINICA, 2022, 1-9. DOI： 10.12236/DZXB.20201222.

摘要

本文主要研究采用雪崩光电二极管（Avalanche Photodiode

APD）和PIN（Positive-Intrinsic-Negative）光电二极管作为接收机时，水下无线光通信（Underwater Wireless Optical Communication

UWOC）系统的误码率（Bit Error Rate

BER）性能及其优化. 具体而言，于文中提出并通过数值仿真验证了一种含指向误差的双指数函数路径损耗模型，以更全面地描述清澈海洋水质UWOC的信道特性. 基于此模型，在上述两种接收机场景下，分别推导了采用OOK（On-off Keying）调制时UWOC系统的理论BER闭型表达；以最小化BER为优化目标，证明该优化问题实际上是一个关于接收机倾斜角的凸优化问题，并给出了相应的理论解与数值仿真验证. 理论分析和仿真结果均表明：根据理论计算与仿真得到的最佳倾斜角，可以合理地倾斜接收机，相较于未倾斜前的UWOC系统误码性能，其性能提升幅度最大能达到

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Abstract

The bit error rate (BER) and its associated optimization of an underwater wireless optical communication (UWOC) system employing avalanche photodiode (APD) and P-i-N (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.

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Keywords

references

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