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

作　　者：李岳衡[1] 徐贻宁 居美艳[1] 黄平[1] LI Yueheng;XU Yining;JU Meiyan;HUANG Ping(School of Computer and Information,Hohai University,Nanjing 211100,China)

机构地区：[1]河海大学计算机与信息学院,江苏南京211100

出　　处：《通信学报》2023年第8期111-124,共14页Journal on Communications

基　　金：国家自然科学基金资助项目(No.61832005)。

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。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.

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 

分 类 号：TN929.3[电子电信—通信与信息系统]