摘要
高阶QAM较BPSK／QPSK能在有限的带宽内能传输更多的信息量，因此广泛应于有线通信系统中。而对于无线光通信，大气湍流引起的光强闪烁效应对高阶QAM信号的影响很大，本文采用多模盲均衡算法克服此类噪声。系统仿真中使用Gamma-Gamma模型模拟大气湍流信道，对比了不同噪声情况下接收信号星座图的聚敛性，结果表明在传输过程中影响信号质量的主要因素是乘性噪声。最后搭建了64-QAM实验系统证明上述算法的可行性。
High-order Quadrature Amplitude Modulation （QAM） in a limited bandwidth can transmit more information than either BPSK or QPSK system. Therefore, the technology is widely used in cable communication systems. While optical scintillation affected the high-order QAM system easily. The multi- mode blind signal equalization is used to reduce the influence of scintillation caused by atmospheric turbulence. In simulation, the turbulence channel was modeled by Gamma-Gamma distribution. The constellation of receiving signal shows the different points dispersions under different channel noise situations. Results show that the transmitted signal was primarily affected by multiplicative noise. A 64- QAM experimental system is built to demonstrate the feasibility of the system under real situation.
作者
柯熙政
解孟其
石碧瑶
Ke Xizheng;Xie Mengqi;Shi Biyao(School of Automation and Information,Xi＇an University of Technology,Xi＇an 710048,China)
出处
《红外与激光工程》
EI
CSCD
北大核心
2018年第A01期68-73,共6页
Infrared and Laser Engineering
基金
国家自然科学基金（61377080）
国家科技创新基金（13C26213201867）
陕西省重点产业创新项目（2017ZDCXL-GY-06-01）
