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

Abstract

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

CLC Number:

TN929.12

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.

Figures/Tables 14

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

References 25

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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

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

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