GGD弱湍流环境含零视轴指向误差MISO-UWOC系统容量分析

doi:10.11959/j.issn.1000-436x.2023152

通信学报 ›› 2023, Vol. 44 ›› Issue (8): 111-124.doi: 10.11959/j.issn.1000-436x.2023152

• 学术论文 • 上一篇

GGD弱湍流环境含零视轴指向误差MISO-UWOC系统容量分析

李岳衡, 徐贻宁, 居美艳, 黄平

河海大学计算机与信息学院，江苏南京 211100

修回日期:2023-05-29 出版日期:2023-08-01 发布日期:2023-08-01
作者简介:李岳衡（1971- ），男，湖南永兴人，博士，河海大学教授，主要研究方向为水下无线光通信、通信信号处理、人工智能与数学优化、大规模与紧凑型MIMO传输技术
徐贻宁（1999- ），女，江苏宿迁人，河海大学硕士生，主要研究方向为水下无线光通信、通信信号处理
居美艳（1979- ），女，江西瑞昌人，博士，河海大学讲师，主要研究方向为水下无线光通信、移动通信关键技术、通信信号处理
黄平（1972- ），女，重庆人，博士，河海大学高级工程师，主要研究方向为水下无线光通信、纠错编解码技术、新型编码调制技术等
基金资助:
国家自然科学基金资助项目(61832005)

Capacity analysis for MISO-UWOC systems over GGD weak turbulence with zero boresight pointing error

Yueheng LI, Yining XU, Meiyan JU, Ping HUANG

School of Computer and Information, Hohai University, Nanjing 211100, China

Revised:2023-05-29 Online:2023-08-01 Published:2023-08-01
Supported by:
The National Natural Science Foundation of China(61832005)

摘要/Abstract

摘要：

选取广义Gamma 分布（GGD）来表征弱海洋湍流，提出了一个包含GGD弱湍流、零视轴指向误差、以及无衰落信道冲激响应隐路径损耗及多径效应的混合衰落信道模型。利用Meijer-G函数推导出采用选择性发送（ST）下的多入单出-水下无线光通信（UWOC）系统在考虑及忽略符号间干扰（ISI）情况下的遍历容量和中断容量数学表达，并利用数值仿真验证上述理论推导的正确性。仿真结果表明，相较于传统点对点传输模式，在同等信道条件及系统参数设置下，以发射端数N=2为例，UWOC系统的遍历容量至少提升了1.3倍，而中断容量则最大下降超过60%；不过，ISI的引入将严重降低此性能改善。

关键词: GGD弱湍流, 水下无线光通信, 多入单出, 指向误差, 遍历容量, 中断容量

Abstract:

Generalized Gamma distribution (GGD) was chosen to describe the weak oceanic turbulence, and a new hybrid fading channel model that integrated the GGD weak turbulence, the zero boresight pointing error, and the implicit path loss plus multipath propagation characterized by the fading free impulse response (FFIR) was proposed.Subsequently, mathematical expressions for the ergodic capacity and outage capacity of the multiple-input single-output underwater wireless optical communication (MISO-UWOC) systems were derived through the Meijer-G function under a selective transmission (ST) diversity scheme especially while inter-symbol interference (ISI) effects were considered or not.Finally, the correctness of the theoretical formulas derived above was verified by some numerical results.The simulation results show that with the introduction of the ST diversity, the ergodic capacity of the MISO-UWOC systems, taking the transmission ports N=2 as an example, is at least 1.3 times better than that of the conventional point-to-point (P2P) transmission under the same channel condition and system parameters, while the maximum outage capacity decreases is also more than 60% compared with the conventional P2P one.However, the introduction of the ISI will severely reduce this performance improvement.

Key words: GGD weak turbulence, UWOC, MISO, pointing error, ergodic capacity, outage capacity

中图分类号:

TN929.3

李岳衡, 徐贻宁, 居美艳, 黄平. GGD弱湍流环境含零视轴指向误差MISO-UWOC系统容量分析[J]. 通信学报, 2023, 44(8): 111-124.

Yueheng LI, Yining XU, Meiyan JU, Ping HUANG. Capacity analysis for MISO-UWOC systems over GGD weak turbulence with zero boresight pointing error[J]. Journal on Communications, 2023, 44(8): 111-124.

图/表 11

图1

表1

FFIR模拟及数值仿真主要参数"

参数	数值
传输速率R_b/(Gbit·s^-1)	1
光源波长λ/nm	532
HG模型非对称因子g	0.924
光波束宽度W_b/mm	3
透射光子总数N_t	10^{- 6}
接收机半角视场θ_FoV	80°
光子权重阈值W_th	10^{- 4}
量子效率η	0.8
电子电荷q/C	1.6×10^-9
普拉克常数h	6.626×10^-34
水中光速c₀/(m·s^-1)	2.266×10⁸
玻尔兹曼常数K/(J·K^-1)	1.38×10^-23
等效开尔文温度T /K	290
负载电阻R_L/Ω	100
滤波器带宽B/GHz	10
闪烁指数 $σ_{I}^{2}$	0.107 4
GGD模型形状参数c	3
光束宽度wz/m	0.2
中断容量阈值C_th/(bit·(s·Hz)^-1)	10
接收机位置	深海

表1

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GGD弱湍流环境含零视轴指向误差MISO-UWOC系统容量分析

Capacity analysis for MISO-UWOC systems over GGD weak turbulence with zero boresight pointing error

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