Research On Key Technologies Of Ultraviolet Communication Network

Wireless ultraviolet(UV)communication is a new communication mode,using the scattering process of UV photons by gas molecules and atmospheric particles for information transmission,which has the advantages of high security,strong anti-jamming ability,all-weather and omnibearing operations and non-line-of-sight(NLOS)communication.It can adapt to the complex geographical environment,and has broad prospects in military operations and mountainous terrain.With the deepening of the research,point-to-point small-range communication has difficulty in meeting the needs of multi-node communication,so it is urgent to establish UV communication network,and people have begun to consider combining the Ad Hoc network to build the ultraviolet communication network.Aiming at the key problems of UV communication network,the following several works are carried out:1.Based on the characteristics of scattering and absorption of ultraviolet photons,analyzing the models of UV single scattering and multiple scattering communication system.According to the Monte Carlo method,the transmission process of photon is simulated and the UV multiple scattering channel has been modeled and analysed.The experimental platform of UV communication system is built,and the relationship curve between the path loss and the distance is obtained by testing and simulation,and the simulation model is verified.2.The influence of the height difference and the interference between the communication links on the performance of the UV communication system are studied.A transmission model of NLOS UV multiple scattering communication with different height difference is established,the influence of height different and the elevation angle and the off-axis angle under different height difference on the bit error rate(BER)of system are simulated and analyzed.Then We propose a set of ultraviolet communication transceiver link models,and discuss the influence of various parameters on the multi-user interference based on these models.3.The UV transceiver device and node positioning technology and mode localization technology are studied.Combined with the transmission characteristics of UV,a scheme of transceiver device which can rotate is put forward.The relationshipbetween the received power and the communication distance is given for the transmission mode of line-of-sight(LOS)or NLOS single scattering.Then the rotation region of the device is divided into a plurality of sectors,and the relative positions of the nodes can be obtained by the communication distance and the sector information.4.Traditional routing protocols for wireless Ad Hoc networks are analyzed,and then according to the channel characteristics of UV communication,a routing algorithm based on space division multiplexing for UV communication network is proposed,and the influence of the number of nodes on UV communication network in a certain moving area is discussed.According to the above researches,the feasibility of UV communication system is verified,and the design proposal of transceiver node is given.the relationship between the receiving power and the communication distance is simulated and analysed,the feasibility of UV communication network node localization algorithm is verified.Finally,The possibility of the combination of UV communication technology and wireless Ad Hoc network is verified by simulation.These studies have laid a theoretical foundation for UV communication network technology.