低密度奇偶校验码
计算机科学
键控
相移键控
衰退
误码率
副载波
前向纠错
蒙特卡罗方法
独立同分布随机变量
电子工程
算法
光学
解码方法
电信
物理
正交频分复用
频道(广播)
数学
随机变量
统计
工程类
作者
Ang Li,Ping Wang,Weina Pang,Wenwen Chen,Sheng Liu,Lixin Guo
出处
期刊:Applied Optics
[The Optical Society]
日期:2020-02-07
卷期号:59 (5): 1353-1353
被引量:6
摘要
The average bit error rate (ABER) performance of a low-density parity-check (LDPC)-coded multi-hop parallel underwater wireless optical communication (UWOC) system is investigated with the combined effects of absorption, scattering, the misalignment characterized by the beam spread function, and the ocean turbulence-induced fading modeled by log-normal distribution. With the max-min criterion as the best path selection scheme, the cumulative distribution function for identically and independently distributed and non-identically and independently distributed links are derived, respectively. Then, the analytical ABER expressions of binary phase shift keying and multiple phase shift keying subcarrier intensity modulation schemes are deduced with the help of the Gauss–Laguerre quadrature rule, and they are also confirmed by Monte Carlo simulation. In addition, LDPC codes are applied in the simulation to improve the system performance. The results show that the combined degrading effects are mainly limited by the link length, especially under the coastal ocean condition. And the multi-hop parallel transmission demonstrates good ABER performance and can expand the communication range in ocean. Furthermore, LDPC codes can significantly improve the ABER performance of the UWOC system, and the coding gain is strongly affected by channel conditions and the corresponding parameters of LDPC codes. This work is beneficial for the UWOC system design.
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