激光通信中OOK/QPSK调制模式下图片传输特性的对比  

Comparison of Image Transmission Characteristics in OOK/QPSK Modulation Modes in Laser Communication

作　　者：李帝水 LI Di-shui(The No.92682 Troop of PLA,Zhanjiang 524000,China)

机构地区：[1]中国人民解放军92682部队,广东湛江524000

出　　处：《光学与光电技术》2024年第2期114-121,共8页Optics & Optoelectronic Technology

摘　　要：针对目前信息爆炸式增长对于通信信道容量的更高需求,以图片传输为例,在MATLAB软件中仿真对比了激光通信中开关键控(On-Off Keying,OOK)调制和正交位移键控(Quadrature Phase Shift Keying,QPSK)调制这两种常见的调制方式下,图片经过加性高斯噪声信道和莱斯信道传输后的传输结果;同时也对比了两种调制方式下的误码率曲线。仿真结果显示,无论是那种调制方式,接收到的图片都会随噪声的增加而出现明显劣化,但是加性高斯信道的劣化速度比莱斯信道更缓慢;在相同信道条件下,图片经过QPSK调制后的劣化程度优于OOK调制;误码率的对比结果显示QPSK调制方式的误码率明显优于OOK调制。通过仿真结果可以得出,QPSK调制在噪声环境下的性能相较OOK调制有其独特的优势,这为激光通信系统中调制方式的选择提供了参考。Aiming at the current explosive growth of information and the higher demand for communication channel capacity,taking image transmission as an example,the transmission results of images transmitted through additive Gaussian noise channel and Rician channel under two common modulation methods in laser communication,OOK modulation and QPSK modulation,are simulated and compared in MATLAB software.At the same time,the error rate curves under two modulation methods are also compared.The simulation results show that regardless of the modulation method,the received image will significantly deteriorate with the increase of noise,but the degradation speed of additive Gaussian channel is slower than that of Rice channel.Under the same channel conditions,the degradation of images after QPSK modulation is better than that of OOK modulation.The comparison of error rates shows that the QPSK modulation method has a significantly better error rate than OOK modulation.Through the simulation results,it is concluded that QPSK modulation has its unique advantages over OOK modulation in noise environment,which provides a reference for the selection of modulation methods in laser communication systems.

关 键 词：激光通信 加性高斯白噪声信道 莱斯信道 OOK调制 QPSK调制 

分 类 号：TN929.1[电子电信—通信与信息系统]