Research On Channel Transmission Characteristics Of Wireless Ultraviolet Mobile Ad Hoc Networks

Ultraviolet communication has the advantages of non-line-of-sight(NLOS)transmission,low background noise and strong confidentiality.It has a better application prospects in military field.In this dissertation,the transmission characteristics of ultraviolet in the atmospheric channel are studied,and the mobile Ad Hoc network of ultraviolet is explored.The main work is as follows:1.Traversing tiny unit method(TTUM)is proposed for the single-scattering transmission model of ultraviolet,and the system path loss and impulse response obtained by TTUM matched with Monte Carlo simulation results and experimental test results.TTUM has the advantages of simple operation,fast running speed,suitable for embedded device operation.2.The impulse response and channel capacity of the ultraviolet communication system are analyzed.The relationship between the impulse response,the channel capacity and the geometrical parameters such as the multiple scattering,the elevation angle of transmitter and receiver,beam angle,field of view(FOV)angle and off-axis angle are given.It is verified that the communication distance of the transceiver is measured by measuring the intensity and pulse response width of the received ultraviolet.3.A NLOS ultraviolet communication model with high difference between the transmitter and receiver is established.The relationship between the system error rate and the height difference between the transmitter and receiver,as well as the relationship between the system error rate and the elevation angle of the transceiver is analyzed.It is pointed out that when the beam angle and the FOV angle are equal,the system error rate is the smallest when the transmitter and receiver elevation difference is zero.BER can be reduced by adjusting the elevation angle of the transmitter when the height of the transmitter is lower than that of the receiver;BER can be reduced by adjusting the elevation angle of the receiver when the height of the transmitter is higher than that of the receiver.4.Based on the principle of space division multiplexing,taking into account the line of sight and NLOS communication methods,the design scheme of the communication node of the ultraviolet mobile Ad Hoc network is given.Based on the design scheme,the method of acquisition,pointing and tracking between two nodes is given,and the communication performance between two nodes is analyzed.5.A model that analyzes the interference between two links in wireless ultraviolet network communication is established.The relationship between the error rate of the system and the angle between the link,the elevation angle of the transceiver,the beam angle and the angle of FOV are analyzed,and the strategy of reducing inter-link interference is given.The research of this dissertation provides the theoretical basis and experimental basis for the design of wireless ultraviolet communication links and wireless UV mobile Ad Hoc networks.