红外与激光工程, 2017, 46 (12): 1222004, 网络出版: 2018-01-19  

无载波幅度相位调制无线光通信系统研究

Research on the carrierless amplitude and phase modulation wireless optical communication system
作者单位
西安理工大学 自动化与信息工程学院, 陕西 西安 710048
摘要
无载波幅度相位 (Carrierless Amplitude and Phase,CAP)调制是一种数字化方式的正交幅度调制(Quadrature Amplitude Modulation,QAM)。由于CAP调制具有频谱利用率高、成本低、复杂度小等优点, 所以逐渐成为实现短距离高速光通信系统的一种备选方案。首先通过比较CAP调制和QAM的功率谱分析了这两种调制方式的特性, 然后在大气信道仿真模型(Gamma-Gamma光强起伏分布模型)条件下, 基于Matlab仿真分析了滤波器滚降系数, 滤波器长度和采样时钟偏移对CAP调制无线光通信系统性能的影响并给出最优参数值。由仿真可知, 采样时钟偏移会引起接收端信号的相位偏移, 所以需要在接收端对相位畸变进行一定的补偿, 文中也对后期所需的均衡算法进行了一些研究, 希望能对以后CAP系统的设计有所帮助。最后对仿真结果进行了实验验证。
Abstract
Carrierless amplitude and phase (CAP) modulation is a way of digital quadrature amplitude modulation (QAM). As the CAP modulation has the advantages of high spectrum efficiency, low cost, less complexity, etc, it gradually become an alternative option for the implementation of short distance high speed optical communication system. Firstly, the properties of these two kinds of modulation mode were analyzed by comparing the power spectrum of CAP modulation and QAM, then under the conditions of atmospheric channel simulation model(Gamma-Gamma distribution of light intensity fluctuation model), the influences of rolling pressure coefficient of filter, the length of filter and sampling clock precision on the performance of the CAP modulation wireless optical communication system were analyzed based on the Matlab simulation and the optimal parameter values were given. The simulation result shows that the sampling clock offset will cause the phase shift of the received signal, so it is needed to compensate the phase distortion in the receiving end. In addition, the research on the equalization algorithm needed by later was also carried out and it is hoped that it can provide some help for the design of CAP system in the future. Finally the simulation results had been verified by experiment.

柯熙政, 李梦帆. 无载波幅度相位调制无线光通信系统研究[J]. 红外与激光工程, 2017, 46(12): 1222004. Ke Xizheng, Li Mengfan. Research on the carrierless amplitude and phase modulation wireless optical communication system[J]. Infrared and Laser Engineering, 2017, 46(12): 1222004.

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