Research On Key Technologies Of Orbital Angular Momentum In Open Source 5G Radio Access Network

Open source 5G wireless communication system has become an important branch of 5G wireless communication system because of its openness and flexibility.The open source 5G wireless communication system can flexibly combine mobile communication services and conveniently integrate new wireless network technologies.However,due to the implementation of open source software and general purpose processor,the transmission performance of open source 5G radio access network is insufficient and it is difficult to effectively improve the hardware and software.To solve this problem,this paper uses orbital angular momentum technology to improve the transmission capacity of open source 5G radio access network.Because of its natural orthogonality,orbital angular momentum wave can be used in open source 5G wireless communication system to improve the transmission capacity of airinterface.But for the combination of both,there are still some shortcomings in the radio access network base station,wireless cell and airinterface transmission.First of all,aiming at the problem that the base station of open source 5G radio access network does not yet support orbital angular momentum application,this paper implements the open source orbital angular momentum wireless communication prototype system and applies orbital angular momentum mode multiplexing technology to open source 5G radio access network to improve the airinterface transmission rate.Considering the insufficient computational performance of the radio access network base station of the orbital angular momentum prototype system,this paper proposes a high-performance orbital angular momentum prototype system architecture based on heterogeneous computing.In this architecture,the link layer and physical layer of base station airinterface protocol stack are separated and heterogeneous physical layer is introduced to accelerate physical layer module.The experimental results show that orbital angular momentum multiplexing technology can effectively improve the performance of source 5G radio access network,and the heterogeneous computing method can effectively improve the processing performance of the base station in the prototype system.Secondly,to solve the problem of interference between adjacent wireless cells in the radio access network of open source 5G and orbital angular momentum prototype system,this paper applies orbital angular momentum multiplexing technology to networking,and proposes a radio access network scheme based on orbital angular momentum different modes networking method.In this scheme,orbital angular momentum waves with different modes are used in adjacent wireless cells to reduce the interference between adjacent cells.By modeling the wireless cell and the atmospheric turbulence channel,the outage probability of the wireless cell is calculated under the orbital angular momentum different modes networking method.The experimental results show that the orbital angular momentum different modes networking method can effectively reduce the interference between adjacent wireless cells.Finally,aiming at the divergence problem of orbital angular momentum wave in the process of transmission through airinterface,an algorithm for transmitting orbital angular momentum wave with the same divergence is proposed based on the uniform concentric circular arrays.The experimental results show that the algorithm can transmit orbital angular momentum waves with different frequencies and different modes but the same divergence characteristics.