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

doi:10.11959/j.issn.1000-436x.2019103

通信学报 ›› 2019, Vol. 40 ›› Issue (5): 144-152.doi: 10.11959/j.issn.1000-436x.2019103

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

修回日期:2019-04-02 出版日期:2019-05-25 发布日期:2019-05-30
作者简介:宋鹏（1976- ），男，陕西大荔人，博士，西安工程大学副教授，主要研究方向为无线光通信、光信号接收与处理、嵌入式技术等。|苏彩霞（1989- ），女，河南西华人，西安工程大学硕士生，主要研究方向为紫外光通信、移动自组网定位。|赵太飞（1978- ），男，河南浚县人，博士，西安理工大学教授，主要研究方向为紫外光通信技术、路由技术、网络抗毁性技术、物联网技术等。|陈锦妮（1980- ），女，陕西西安人，博士，西安工程大学讲师，主要研究方向为大气激光通信技术。|朱磊（1979- ），男，四川绵阳人，博士，西安工程大学教授，主要研究方向为信号与信息处理、检测技术、控制工程、嵌入式系统应用。|张晓丹（1981- ），女，辽宁葫芦岛人，博士，西安工程大学副教授，主要研究方向为波动信号处理及成像、图像处理。
基金资助:
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(U1433110);陕西省科技厅自然科学基础研究计划基金资助项目(2018JQ4016);西安市科技局科技指导基金资助项目(201805030YD8CG14-9);西安工程大学博士科研启动基金资助项目(BS201810)

Channel capacity analysis of non-line-of-sight ultraviolet communication in noncoplanar geometry based on traversing tiny unit method

Peng SONG¹,Caixia SU¹,Taifei ZHAO²,Jinni CHEN¹,Lei ZHU¹,Xiaodan ZHANG¹

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

Revised:2019-04-02 Online:2019-05-25 Published:2019-05-30
Supported by:
The National Natural Science Foundation of China-Joint Research Funding of Civil Aviation Administration(U1433110);Shaanxi Natural Science Basic Research Project of Shaanxi Science and Technology Office(2018JQ4016);Science and Technology Project of Xi’an Science and Technology Bureau(201805030YD8CG14-9);Doctor’s Research Start-up Fund of Xi’an Polytechnic University(BS201810)

摘要/Abstract

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

Abstract:

Channel capacity reflects the ability of the system to transmit information without errors.The path loss and impulse 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 angle and the communication distance.When the elevation angles of transmitter and receiver are less than 40°,the channel capacity 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 divergence 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

中图分类号:

TN929.12

宋鹏,苏彩霞,赵太飞,陈锦妮,朱磊,张晓丹. 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[J]. 通信学报, 2019, 40(5): 144-152.

Peng SONG,Caixia SU,Taifei ZHAO,Jinni CHEN,Lei ZHU,Xiaodan ZHANG. Channel capacity analysis of non-line-of-sight ultraviolet communication in noncoplanar geometry based on traversing tiny unit method[J]. Journal on Communications, 2019, 40(5): 144-152.

图/表 14

图1

图2

表1

部分系统仿真参数"

参数	值
波长λ/ nm	266
瑞利散射系数 $k_{s}^{R} / m^{- 1}$ s	0.24×10^-3
瑞利散射相函数参数γ	0.017
米氏散射系数 $k_{s}^{M} / m^{- 1}$	0.25×10^-3
米氏不对称相函数参数g	0.72
吸收系数k_a/ m^-1	0.74×10^-3
接收孔径面积 $A_{r} c m^{2}$	1.92
米氏相函数参数f	0.5
遍历微小单元法分割次数M	60
滤光片透射率η_f	0.3
光电倍增管的探测效率η_d	0.2
普朗克常数h/( J·s)	6.62×10^-34
光速c/(m.s^-1)	3×10⁸

表1

表2

图3

图4

图5

图6

图7

表3

图8

图9

图10

图11

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参数	值
发射端仰角θ_t	30°
发散角半角φ_t	5°
发收端偏轴角α_t 和α_r	0°
收端仰角θ_r	30°
视场角半角φ_r	15°
通信距离d /m	100

参数	值
实验温度/℃	1
风速/( m.s^-1)	1.5
气压/ kPa	102.8
能见度/ km	10
相对湿度	51%
发射信号	占空比为50%的方波信号
发射频率/ kHz	10
发射光功率/ mW	0.6

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

Channel capacity analysis of non-line-of-sight ultraviolet communication in noncoplanar geometry based on traversing tiny unit method

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