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在自由空间光通信(FSO)中,由系统设计以及大气湍流所引起的光强闪烁和相位起伏会造成圆偏振控制误差,这严重影响圆偏振位移键控(CPolSK)通信系统的性能。因此,基于Gamma-Gamma大气信道模型,在较全面考虑光强起伏、相位噪声和圆偏振控制误差三个参数的基础上,建立了CPolSK系统信道的数学统计模型,推导了平均信道容量的闭合表达式,仿真研究了误码率在连续相位噪声下的性能以及三个参数对信道容量...
LDPC在gamma-gamma信道下的性能分析
光通信 低密度奇偶校验码 调制方式 gamma-gamma湍流信道
2014/3/31
为了提高无线光通信系统的性能,将低密度奇偶校验码作为信道编码,在已知信道状态信息的条件下,对低密度奇偶校验码(LDPC)+二进制脉冲位置调制(BPPM)系统与LDPC+开关键控(OOK)系统分别在加性高斯白噪声(AWGN)、弱湍流、中等湍流和强湍流信道中的性能进行了比较;仿真了OOK和BPPM在各个强度湍流信道下的编码增益;并对LDPC结合不同进制数的脉冲位置调制(PPM)进行了分析。结果表明,L...
A high dynamic range liquid crystal display (HDRLCD) can enhance the contrast ratio of images by utilizing locally controlled dynamic backlight.We studied the HDR-LCD as a dualpanel display: a backlig...
Gamma-ray irradiation effects on dynamic gain of erbium-doped fiber amplifiers
erbium-doped fiber amplifier gamma-ray irradiation
2011/5/9
Experiments were made of the gamma-ray irradiation effect on the dynamic performance of
erbium-doped fiber amplifiers (EDFAs). The frequency responses of EDFAs before and after
irradiation are depen...
Spatial Distribution of Polarized Gamma Ray Generated Through Laser Compton Scattering on New SUBARU Storage Ring
Laser Compton scattering Gamma ray Storage ring
2009/6/8
Laser Compton Scattering gamma ray has been produced via a Nd:YAG laser head-on colliding the high energy electron beam of NewSUBARU storage ring by maximum energy of 17.6 MeV and flux of 1.75 × 104 c...
视觉估计显示器ｇａｍｍａ在Ｉｎｔｅｒｎｅｔ网络上的应用
视觉光学 显示器 ｇａｍｍａ 人眼视觉系统
2011/4/18
使用自行开发出的基于Ｗｅｂ的ｇａｍｍａ估计程序，分别通过Ｉｎｔｅｒｎｅｔ对ＣＲＴ 和ＬＣＤ 显示
器在暗、微暗和办公环境三种观察环境下，进行了视觉估计显示器ｇａｍｍａ精确度研究实验．实验得出：不同实验者估计偏差范围，对ＣＲＴ 和ＬＣＤ 显示器分别是０．１３和０．２０；估计与测量结果的平均误差范围，对ＣＲＴ 和ＬＣＤ 显示器分别是０．０７和０．１７；ｇａｍｍａ估计基本与观察环境无关；观察视角对ＬＣ...
Performance analysis of bit error rate for free space optical communication with tip-tilt compensation based on gamma–gamma distribution
free space optical communication atmospheric turbulence
2011/5/10
In this paper, the gamma – gamma probability distribution is used to model turbulent channels. The bit error rate (BER) performance of free space optical (FSO) communication systems employing on-off k...