采用mQAM和孔径平均的水下弱湍流MIMO系统性能分析  

Performance Analysis of MIMO UWOC Systems with Weak Turbulence Channels Using mQAM and Aperture Averaging

作　　者：王建英 殷洪玺[1] 季秀阳[1] 梁彦军 景连友 Wang Jianying;Yin Hongxi;Ji Xiuyang;Liang Yanjun;Jing Lianyou(School of Information and Communication Engineering,Dalian University of Technology,Dalian,Liaoning 116024,China;College of Information Science and Engineering,Xinjiang University,Urumqi,Xinjiang 830046,China)

机构地区：[1]大连理工大学信息与通信工程学院,辽宁大连116024 [2]新疆大学信息科学与工程学院,新疆乌鲁木齐830046

出　　处：《光学学报》2021年第19期13-24,共12页Acta Optica Sinica

基　　金：国家自然科学基金(61871418,61801079);水下信息与控制国防重点实验室开放基金(6142218200408)。

摘　　要：采用Log-normal分布模拟海洋弱湍流信道,接收机采用等增益合并方式,在考虑雪崩光电二极管(APD)散粒噪声、信道衰减、几何损耗、Log-normal湍流和孔径平均因子等链路条件下,从理论上推导了水下无线光通信多输入多输出系统平均误码率和信道平均容量的上界表达式,并定量分析讨论了不同链路参数对系统平均误码率和信道平均容量的影响。数值结果表明,采用调制指数合适的正交幅度调制方式以及较大的天线数、接收孔径、发射光功率,均有助于提升系统性能。A simulated oceanic weak turbulence channel in Log-normal distribution and an equal-gain combining receiver were adopted in this paper. Various link parameters were taken into account, including avalanche photodiode(APD) shot noise, channel fading, geometrical loss, Log-normal turbulence, and aperture-averaging factor. On this basis, expressions for the average bit error rate and the upper bound of the average channel capacity of the multiple-input multiple-output(MIMO) underwater wireless optical communication(UWOC) system were theoretically derived. Simultaneously, the influences of the aforementioned parameters on the average bit error rate and average channel capacity of the system were discussed quantitatively. Simulation results show that quadrature amplitude modulation with a proper modulation index, more antennas configured, larger receiving aperture, and higher transmitting power all contribute to better system performance.

关 键 词：海洋光学 弱湍流 正交幅度调制 孔径平均 平均误码率 信道平均容量 

分 类 号：TN929.3[电子电信—通信与信息系统]