Design And Simulation Of Orbital Angular Momentum Communication Network

Orbital Angular Momentum(OAM),as a new degree of freedom for future infinite communication,has been studied in recent years.Among the 5G and future 6th generation mobile communication system(6G)candidate technologies.The orbital angular momentum is used as a data information carrier for free space optical communication.Because the mode of orbital angular momentum is orthogonal and infinite,the reuse of orbital angular momentum can bring huge capacity increase.With its introduction into the infinite electromagnetic wave communication,the orbital angular momentum communication can meet the requirements of the large capacity of the future 6G communication and the high speed of 1000Gb/s.OAM provides the possibility to realize ultra long distance,low delay high-speed communication,and can alleviate the current spectrum resource tension and channel capacity constraints.Design and simulate the orbital angular momentum communication network,which is a confirmatory experiment for future 6G hot spot candidate technologies.And solve the phase-shift problem.The specific research content is as follows:(1)This thesis analyze and study the theoretical basis of orbital angular momentum(OAM)as a new transmission dimension and the causes of problems in the communication process,and design a three-layer OAM communication system: physical layer,data link layer and network layer.It mainly solves the problems that may occur in the physical layer and network layer.(2)Aiming at the physical layer of OAM communication system and the problem of large phase shift of OAM wave in the physical layer,this thesis proposes a method based on pilot insertion and training sequence verification in the modulation process.First,the physical layer modulates and demodulates the OAM signal through 256 QAM based on FPGA.Through Simulink simulation and FPGA behavior level simulation,verify the bit error rate,phase offset.(3)Considering the characteristics of OAM’s short distance transmission,the network layer verifies the feasibility of the communication network through the Ad Hoc networking through the improved AODV routing algorithm,and proposes an optimized AODV algorithm;Compare with the traditional AODV algorithm,the optimized LAODV algorithm significantly improve the network throughput and the success rate of data transmission.