2019 年 5 月 Journal on Communications May 2019
2019103-1
第 40 卷第 5 期 通 信 学 报 Vol.40
No.5
基于遍历微小单元法非直视非共面紫外光通信信道容量分析
宋鹏
1
,苏彩霞
1
,赵太飞
2
,陈锦妮
1
,朱磊
1
,张晓丹
1
(1. 西安工程大学电子信息学院,陕西 西安 710048;2. 西安理工大学自动化与信息工程学院,陕西 西安 710048)
摘 要:信道容量反映了系统无差错传输信息的能力。基于遍历微小单元法求出系统的路径损耗和脉冲响应,然
后对脉冲响应采样序列进行离散傅里叶变换,得到系统的频率响应,计算出系统的 3 dB 带宽。考虑信号光引起
的散粒噪声,根据量子极限法求出系统的信噪比,进而用香农公式仿真分析非直视非共面紫外光通信系统信道容
量和收发端几何参数之间的关系。结果表明,信道容量随着接收端偏轴角和通信距离的增大而减小,当收发仰角
小于 40°时,随着收发仰角增大,信道容量快速减小,并且发射端仰角对信道容量的影响更显著;当发散角增大
时,系统信道容量几乎不变;而当视场角增大时,系统信道容量增大。
关键词:光通信;紫外光散射;非直视;遍历微小单元方法;信道容量
中图分类号:TN929.12
文献标识码:A
doi: 10.11959/j.issn.1000−436x.2019103
Channel capacity analysis of non-line-of-sight ultraviolet
communication in noncoplanar geometry based
on traversing tiny unit method
SONG Peng
1
, SU Caixia
1
, ZHAO Taifei
2
, CHEN Jinni
1
, ZHU Lei
1
, ZHANG Xiaodan
1
1. School of Electronic and Information, Xi’an Polytechnic University, Xi’an 710048, China
2. Department of Electronics Engineering, Xi’an University of Technology, Xi’an 710048, China
Abstract: Channel capacity reflects the ability of the system to transmit information without errors. The path loss and im-
pulse response of the system were calculated based on traversing tiny unit method, and then the frequency response of the
system was obtained by the discrete Fourier transform of the impulse response sampling sequence, and the 3 dB bandwidth
of the system was calculated. Considering the shot noise caused by signal light, the signal-to-noise ratio of the system was
obtained according to the quantum limit method, and then the relationship between the channel capacity and the geometric
parameters of transmitter and receiver in non-line-of-sight noncoplanar ultraviolet communication system were simulated
and analyzed by Shannon formula. The results show that the channel capacity decreases with the increase of the off axis an-
gle and the communication distance. When the elevation angles of transmitter and receiver are less than 40°, the channel ca-
pacity decreases rapidly with the increase of the elevation angles of transmitter and receiver, and the transmitter elevation
angle has a great influence on the channel capacity. The system channel capacity is almost constant with the increase of di-
vergence angle, and the larger the receiver field of view angle, the greater the system channel capacity.
Key words: optical communication, ultraviolet scattering, non-line-of-sight, traversing tiny unit method, channel capacity
收稿日期:2018−08−08;修回日期:2019−04−02
基金项目:国家自然科学基金委员会−中国民航局民航联合研究基金资助项目(No.U1433110);陕西省科技厅自然科学基础
研究计划基金资助项目(No.2018JQ4016);西安市科技局科技指导基金资助项目(No.201805030YD8CG14-9);西安工程大
学博士科研启动基金资助项目(No.BS201810)
Foundation Items: The National Natural Science Foundation of China-Joint Research Funding of Civil Aviation Administration
(No.U1433110), Shaanxi Natural Science Basic Research Project of Shaanxi Science and Technology Office (No.2018JQ4016), Sci-
ence and Technology Project of Xi’an Science and Technology Bureau (No.201805030YD8CG14-9), Doctor’s Research Start-up
Fund of Xi’an Polytechnic University (No.BS201810)