基于气泡群水下信道的高阶QAM误码性能研究  

Research on High-Order QAM Error Performance Based on Bubble Group Underwater Channel

作　　者：马翠兰 项澜 安移 

机构地区：[1]上海理工大学光电信息与计算机工程学院,上海

出　　处：《应用物理》2023年第4期81-88,共8页Applied Physics

摘　　要：水下无线光通信(UWOC)由于其应用广泛是近年的研究热点,水下无线光通信中气泡对激光光束传播的影响降低了通信系统的性能。高斯混合模型很好地表征了气泡在水下环境中的强度波动。为了追求更好的通信效果,针对服从高斯混合模型的水下无线光通信信道,研究了使用高阶正交振幅调制(QAM)的水下无线光通信系统的误码率(BER)性能。考虑了不同气泡密度即水下信道中不同空气流速对系统性能的影响,使用不同阶数的QAM方法进行分析。同时也分析了QAM调制解调结合(7,4)汉明码下的误码性能,对通信性能起到了一定的改善作用。Underwater wireless optical communication (UWOC) is a research hotspot in recent years due to its wide application. The influence of bubbles on laser beam propagation in underwater wireless optical communication reduces the performance of communication system. The Gaussian mixture model well characterizes the intensity fluctuation of bubbles in underwater environment. In order to pursue better communication effect, the bit error rate (BER) performance of underwater wire-less optical communication system using high-order quadrature amplitude modulation (QAM) is studied for underwater wireless optical communication channel obeying Gaussian mixture model. Considering the influence of different bubble densities, that is, different air velocities in the under-water channel, on the system performance, the QAM method of different orders is used for analysis. At the same time, the error performance of QAM modulation and demodulation combined with (7,4) Hamming code is also analyzed, which improves the communication performance.

关 键 词：水下无线光通信 高斯混合模型 高阶正交振幅调制 汉明码 误码率 

分 类 号：TN9[电子电信—信息与通信工程]